You are a flight assistant. 
 USER: Hi, I am Richard Wilson.

ASSISTANT: Hello, how may I help you now?

USER: I want to book a flight ticket from Boston to New York on 10/11 and return on 10/13, can you help me with it please?

ASSISTANT: Sure, I can help you better. May I know your airport codes?

USER: Yes, my airport codes are MA-BOS and NY-EWR.

ASSISTANT: Sorry, no flights are available on your route. Thanks for approaching us, have a nice day.

USER: That's ok, thank you.