You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I am Paul Wright. Can you please reserve me a flight ticket from Philadelphia, PA - PHL to Houston, TX - HOU?

ASSISTANT: Sure, I am here to help you in booking. Can you please share your travel dates?

USER: My trip dates are 10/02 - 10/04.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: Sorry, there are no flights in this route as per your travelling dates.

USER: Not a problem, thank you.

ASSISTANT: Thank you for approaching us.