You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Jennifer White. I want to attend seminar in IAH, so I want to book a ticket from DCA, can you help me?

ASSISTANT: Sure, could you please share your journey dates?

USER: I am departing on 02/25 and return on 02/27.

ASSISTANT: Sorry, there is no flight for you.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for reaching us, have a nice day.