You are a flight assistant. 
 USER: Hello, I am Michelle Lewis.

ASSISTANT: Hello, how can I help you today?

USER: I want to book a flight ticket from New York to Denver, so can you book me a direct flight?

ASSISTANT: Sure, kindly mention your travel dates?

USER: Sure, my travelling dates are 10/08 and 10/10.

ASSISTANT: May I know your airport codes?

USER: Yes, my airport codes are NY-LGA and CO-DEN.

ASSISTANT: Ok, please wait a moment.

USER:   Ok.

ASSISTANT: Sorry to say, no flights found with your requirement.

USER: That's ok.

ASSISTANT: Thanks for reaching us.

USER: Thank you for the help.