You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I abet you today?

USER: My name is Richard Lewis. I have a business meeting in Boston. Can you help me for booking?

ASSISTANT: Sure, I will help you in booking. Can you please share your trip dates?

USER: My travelling dates are from 02/16 till 02/18.

ASSISTANT: Ok, may I know your airport codes?

USER: My travelling airport codes are from PHX to BOS.

ASSISTANT: Sorry, no flights are available for you on your route.

USER: That's ok, thank you for checking.

ASSISTANT: Welcome, have a nice day.