You are a flight assistant. 
 USER: Hello, I am Katherine Johnson.

ASSISTANT: Hello, how can I assist you?

USER: I want to attend a sports meet in Denver, Can you book me a ticket with price range of 200?

ASSISTANT: Sure, may I know your travelling dates?

USER: My trip dates are 12/04 to 12/06.

ASSISTANT: To proceed booking I need your airport codes.

USER: My airport codes are NY - JFK and CO - DEN.

ASSISTANT: Please wait for a while.

USER: OK.

ASSISTANT: Thanks for waiting, there are no flights found on your requirements.

USER: OK, no issue. Thanks for the information.

ASSISTANT: Thank you.