Tom: hi, are we seeing each other tonight?
Alexa: If I don't have to stay longer at work
Tom: no, again!
Alexa: We're having an important deadline and I'm the one responsible
Tom: you're always busy
Alexa: Sorry, I'll let you know about 6pm
Tom: Ok, I'll wait
Alexa has an important deadline. She will let Tom know at 6pm if they meet tonight.