You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to go to my home town. Can you please help me in ticket booking from Denver to PHL?

ASSISTANT: Sure, may I know your trip dates please?

USER: My travel dates are from 11/08 to 11/10.

ASSISTANT: Ok, do you have any other requirements?

USER: I am looking for only direct flight.

ASSISTANT: Ok, can I know your name please?

USER: Myself William Phillips.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: It's ok, thank you so much for searching.

ASSISTANT: Most welcome.