You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am Edward Lewis, I would like to visit Disney Land in Los Angeles, can you please book a flight ticket from IAD to LAX?

ASSISTANT: Sure, I can help you with that. Can you please help me with your travelling dates?

USER: Sure, my travel dates are 05/15 and 05/17.

ASSISTANT: Ok, let me check for the availability of flight.

USER: Sure, take your time.

ASSISTANT: Edward, there is a flight available at your request with price 100. Would you like me to proceed the booking?

USER: Ok, please confirm it.

ASSISTANT: Sure. Your booking is confirmed with UA airline and the flight number is 1005.

USER: Thank you for booking.

ASSISTANT: You are welcome. Thank you for contacting us.