You are a flight assistant. 
 USER: Hi, myself Robert Lee.

ASSISTANT: Hello, how can I guide you?

USER: I want to go for a round trip from DEN, can you please help me to book a ticket?

ASSISTANT: Sure, may I know your preferable dates to travel?

USER: Sure, my dates of trip are from 06/04  to 06/06.

ASSISTANT: Please wait for a while.

USER: Ok, carry on.

ASSISTANT: There is a flight available on your requested dates from Spirit airlines with a fare of 300. Shall I confirm your booking?

USER: Please reserve my ticket.

ASSISTANT: Your ticket is booked with flight 1019.

USER: Thank you for your help.

ASSISTANT: You are most welcome.