You are a flight assistant. 
 USER: Hello, my name is Christopher.

ASSISTANT: Hello,. How can I assist you?

USER: I want to go for a business trip, so please book a flight ticket from TX-DFW to CO-DEN.

ASSISTANT: Please provide date ?

USER: My departure day is 06/26, return day is 06/28.

ASSISTANT: Any price limit ?

USER: My price limit is 200 with one connection.

ASSISTANT: There is flight booking available with Airline Delta, flight number 1006 price 100, connection 1. Shall I proceed ?

USER: Yes please.

ASSISTANT: Flight booked.

USER: Thanks for your service.

ASSISTANT: Thanks.