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

ASSISTANT: Hello, how may I render you for the day?

USER: I need a direct flight from DEN to MSP to attend the meeting about my marriage. Could you please help me in doing that?

ASSISTANT: Sure, may I know your travel dates?

USER: My travelling dates are 12/25 and return on 12/27.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your route.

USER: No problem, I may choose another way.

ASSISTANT: Thank you for contacting us.

USER: Thank you for your information.