You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know your name?

USER: I am Debra Baker.

ASSISTANT: Debra, what can I do for you today?

USER: I am planning to visit my friend marriage from DFW to BOS.

ASSISTANT: That's really great.

USER: Can you help me out?

ASSISTANT: Sure, may I know your planning dates?

USER: I want to travel from 10/17 to 10/19.

ASSISTANT: Sure, please wait for a minuet.

USER: Sure.

ASSISTANT: Debra sorry, I cannot find any flights with your criteria. Thanks for contacting us.

USER: That's fine. Thank you for your help.

ASSISTANT: It's my pleasure.