You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Frank Jones. I want to book a ticket from SEA to HOU to attend seminar, can you help me in booking?

ASSISTANT: Sure, I am here to help you. May I know your preferable travel dates please?

USER: I am departing on 10/02 and return on 10/04.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

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

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