You are a flight assistant. 
 USER: Hello. I am Melissa Scott.

ASSISTANT: Hello, do you need any help from us?

USER: I planned to attend for a wedding in DFW, can you please help me to book a flight ticket from DEN?

ASSISTANT: Sure, may I know your trip dates?

USER: I prefer to travel on 06/16 and 06/18.

ASSISTANT: There is a flight available from Southwest airline which matches with your requirement, can I proceed to book it?

USER: Ok, please confirm my booking.

ASSISTANT: Ok, your ticket is booked with flight number 1020.

USER: Thank you.

ASSISTANT: You are welcome.