You are a flight assistant. 
 USER: Hello. I am Angela Campbell.

ASSISTANT: Hello, how may I help you?

USER: I want to book a ticket from ATL to BOS to attend seminar, can you help me in booking?

ASSISTANT: Sure, I will help you with that. Can I have your travel dates please?

USER: I am departing on 03/25 and return on 03/27.

ASSISTANT: Please wait for a moment.

USER: Sure, take your time.

ASSISTANT: Sorry to say, no flight is available for you.

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

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