You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Please book a flight ticket from DEN to PHL to meet my family.

ASSISTANT: Sure, may I know your good name please?

USER: My name is George Lee.

ASSISTANT: Ok, may I know your travelling dates please?

USER: I want to take off on July, 21 and return back on July, 23.

ASSISTANT: Do you need any connection limit?

USER: No, I need direct flight.

ASSISTANT: Do you have any other specifications please?

USER: No.

ASSISTANT: There is a direct flight of fare 100 with economy class in Hawaiian airline, shall I proceed for booking?

USER: Please proceed.

ASSISTANT: Ok, I have reserved your ticket with flight number 1007.

USER: Thank you.

ASSISTANT: You are welcome.