You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I am Michael Williams. Please book a direct flight from DEN to LAX.

ASSISTANT: Sure, kindly share your travel dates.

USER: My travelling dates are 12/12 and 12/14.

ASSISTANT: Do you have any connection preference?

USER:   I need a direct flight.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

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

USER: That's ok, thank you for the response.

ASSISTANT: Thanks for reaching us.