You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Mary Gonzalez. I am looking for a flight with price 200, can you please book a ticket for me?

ASSISTANT: Sure, can you please share your preferable travel dates?

USER: I would like to travel on 12/13 and return back on 12/15.

ASSISTANT: Could you please provide the airport codes?

USER: I am planning to visit a new place from CLT to DEN.

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

USER: Sure.

ASSISTANT: Mary, there is a flight available with price 100 and the connection is 1 with UA airline. Would you like me to proceed with the booking?

USER: Yes, you can proceed the booking.

ASSISTANT: Your booking is confirmed with 1003 flight number.

USER: Thank you for your service.

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