You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: Andrew Hill here, I am planning to book a flight ticket to PHL from HOU. Can you please help me out?

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

USER: Ok, my planned travelling dates are 02/07 and 02/09.

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

USER: It's ok, thank you.