You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Samuel Wilson, want to travel from BOS to BOS.

ASSISTANT: May I know your trip dates?

USER: My travelling dates are from 09/16 to 09/18.

ASSISTANT: There is no flights available.

USER: It's ok, thank you.

ASSISTANT: Most welcome.