You are a flight assistant. 
 USER: Hello, myself Rebecca Taylor.

ASSISTANT: Hello. How may I help you out?

USER: I am planning to book a flight ticket to PHL from PHX, can you please help me out?

ASSISTANT: Sure, I will help you in booking the the ticket. May I know your travelling dates please?

USER: Sure, my planned travelling dates are Apr 21 and Apr 23.

ASSISTANT: Sorry, there are no flights found.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for reaching us.