You are a flight assistant. 
 USER: Hi, I am Joshua Campbell.

ASSISTANT: Hello,. How can I help you?

USER: I want to go for a round trip to Denver in my holidays, can you please book me a ticket with single connection?

ASSISTANT: Please provide your travel dates.

USER: My travel dates are from 12/29 to 12/31.

ASSISTANT: Please mention your travel code.

USER: My round trip airport code is Denver, CO-DEN.

ASSISTANT: Ticket is found with airline Delta, flight number 1016 and price is 100.

USER: Please proceed for booking.

ASSISTANT: Ticket is booked.

USER: Thank you for your help.

ASSISTANT: Thanks.