You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can we help you?

USER: Please help me in booking flight ticket from LAX to DEN to attend an event.

ASSISTANT: It's my pleasure to help you with your concern. Sure, can you please let me know your trip dates?

USER: My trip dates are Feb 15 to Feb 17.

ASSISTANT: Are you comfortable with connecting flight or do you want to fly with direct flight?

USER: I need a direct flight.

ASSISTANT: Would you like to fly with economy class flight or business class flight?

USER: I am okay with any class.

ASSISTANT: Do you have any other requirements required for your journey?

USER: No.

ASSISTANT: If you can help me with your name, I can proceed further to check with the flights availability.

USER: Jacob Phillips here.

ASSISTANT: Thank you for sharing all the required details, please allow me 2-3 minutes.

USER: Ok.

ASSISTANT: Thank you for waiting, Jacob Phillips. Jacob Phillips, I am afraid to say that there are no flights available for the mentioned dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching our chat service!.