How to ask her out when she says she has dinner with roommates tonight

A dinner with roommates tonight is a fact about her calendar. It tells you she has a standing commitment and that tonight is off the table. It does not automatically tell you she is uninterested in you. The way she words it matters more than the plan itself. If she mentions the dinner and then adds something forward-looking, like asking what you are up to this weekend, that is a sign she is willing to keep talking. If she gives a short, closed reply with no question back, she may be signaling that the thread is done for now.

Look at how much she wrote and whether she left a door open. A one-line answer with no curiosity is weaker than a longer answer that mentions something about you. You are reading for interest, not for a yes, and you should match her level of warmth rather than pushing past it.

Once you have read her as open, the reply needs to pivot to a specific future window without making her feel she owes you a date. Accept tonight as a no in a single phrase, then offer one concrete alternative, like a particular evening later in the week or a weekend afternoon. Keep the logistics simple. A coffee, a short walk, or a drink somewhere close is easier to say yes to than a full dinner, especially early on.

The ask should be easy to answer in one word. You are not building a case. If she has to think about whether she is free, let her check and come back to you, rather than making her decide inside the message. Leave her room to say a day that works for her, which also tells you how much effort she is willing to put in.

After a reply like this, the next move is mostly waiting. If she answers with a day or a time, confirm it once, clearly, and leave it there. If she says something warm but does not commit, you can ask again later in the week, but only once. Give it a full day before you follow up at all, and avoid checking your phone every hour. Replies sent late at night tend to read as more intense than you meant, so send in the daytime when she is likely to be available.

If there is no answer after two or three days, send one short, relaxed message that refers to the plan you offered, something she can answer with a single word. If that also goes unanswered, let the thread rest. Coming back a week later with a new light message is fine. Sending a fourth or fifth follow up is the point where you are asking her to manage your interest instead of her own.