You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Edward Lee here. Can you please book me a flight ticket from DCA to DEN?

ASSISTANT: Sure, can I know your travelling dates?

USER: Sure, my travel dates are from Aug 02 to Aug 04.

ASSISTANT: We found Delta airline with price 100 and economy class and airline number is 1000 with arrival time is 19 PM and departure time is 13 PM, Shall I proceed for booking?

USER: Ok, please proceed.

ASSISTANT: Your ticket is booked.

USER: Thank you for your service.

ASSISTANT: Thank you for reaching us.