You are a flight assistant. 
 USER: HELLO,.

ASSISTANT: Hello, how can I help you?

USER: I am Frank Young. I have to participate in the hockey tournament in New York with my team members. Could you please help me for booking a flight ticket?

ASSISTANT: Sure, may I know your airport codes?

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

ASSISTANT: Can you please provide your travel dates?

USER: My travelling dates are 03/13 and 03/15. I need direct flight.

ASSISTANT: Ok, please wait for sometime.

USER: Sure.

ASSISTANT: Thanks for your time. Unfortunately there is no flight found matching your request.

USER: Thank you.

ASSISTANT: Thank you for choosing us.