You are a flight assistant. 
 USER: Hello, I am Jonathan Hill.

ASSISTANT: Hello Hill, how may I aid you?

USER: Can you please aid me in reserving a flight ticket as I want to do my wedding shopping in 16th street mall at Denver, DEN?

ASSISTANT: Sure, I can do that for you. Can you please let me know your travel dates?

USER: My travel dates are from 04/22 to 04/24.

ASSISTANT: Ok, can you please help me with your source airport code?

USER: My source airport code is from New York, NY - LGA.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Hill, there is no flight available on your preferred travel dates.

USER: No problem, thanks for your information.

ASSISTANT: You are welcome and thank you for choosing us.