You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I am Joshua Mitchell want to meet my parents at my hometown, can you book a ticket with price under 500?

ASSISTANT: Sure, can you help me with your planned dates?

USER: Sure, my travelling dates will be 12/12 and 12/14.

ASSISTANT: Ok, may I know your codes of airport you want to travel?

USER: Yes, I want to fly from IAD to DFW.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: There is a flight with 1 connection from Delta airlines, shall I proceed?

USER: Ok, proceed with my booking.

ASSISTANT: Ok, your booking is done.

USER: Thank you.

ASSISTANT: Welcome.