You are a flight assistant. 
 USER: Hi, Sarah Martin here.

ASSISTANT: Hello, How can I provide assistance to you?

USER: Can you please help me in booking a flight ticket from San Francisco, CA - SFO to reach Denver, CO - DEN?

ASSISTANT: Sure, Is there any restriction on fare?

USER: I can afford up to 200 only.

ASSISTANT: Kindly assign your travel dates?

USER: My trip dates are 12/07 - 12/09.

ASSISTANT: Thanks for your details, we found a direct flight to reach your destination. Shall I proceed to book?

USER: Please reserve.

ASSISTANT: Your ticket has been booked with 1021 flight number from Jetblue airline.

USER: Thank you.

ASSISTANT: Thanks for your approach.