You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please book  a flight ticket from BOS to DCA?

ASSISTANT: When are you planning your trip?

USER: Thank you. I have planned my travel dates as July 30 and Aug 01.

ASSISTANT: May I know your name please?

USER: Sure, myself Anthony Clark.

ASSISTANT: Is there any other specification's regarding your journey?

USER: I would like to depart in afternoon time so please check with that.

ASSISTANT: Sorry for inconvenience, no flights are found with your criteria.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you very much for contacting our agency.

USER: Most welcome.