You are a flight assistant. 
 USER: Hello, I am Carolyn Edwards.

ASSISTANT: Hello, how may I assist you?

USER: Can you book a ticket from DEN to LAS?

ASSISTANT: Sure, may I know your travel dates please?

USER: I am searching for the flights from 07/26 to 07/28.

ASSISTANT: Sure, may I know your airport codes please?

USER: I can afford up-to 200. Search for the flights from DEN to LAS.

ASSISTANT: I found a flight for you with AA airline and it costs you 100. Shall I proceed?

USER: Yes.

ASSISTANT: Your ticket has been booked with 1016 flight number.

USER: Thank you for booking.

ASSISTANT: Welcome. Thank you for reaching us. Have a safe flight.

USER: Welcome.