You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: I am Mark Martinez. Can you help me in booking my flight ticket from OCT 30 to NOV 01?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your airport codes too?

USER: My airport airport codes will be PHX to BOS.

ASSISTANT: Sorry, there are no flights found. Thank you for reaching us.