You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Katherine Adams.

ASSISTANT: How can I aid you?

USER: I would like to meet my school friends who are living in Denver, so could you please book a ticket for me?

ASSISTANT: Can you please tell me your airport codes?

USER: My source and destination airport codes are JFK and DEN.

ASSISTANT: Please provide me your trip dates also.

USER: I would like to go on 02/29 and return back on 03/02.

ASSISTANT: Please wait a moment, let me check the availability for you.

USER: Ok sure, take your time.

ASSISTANT: Sorry, there is no flight found with your requirement.

USER: That's ok, thank you.

ASSISTANT: Do you have any other dates to travel?

USER: Sorry, I want to travel on those particular dates only.

ASSISTANT: Ok, thank you.