You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me with booking a flight ticket from LAX to CLT?

ASSISTANT:  I am here to help you with your concern. Sure, can you please let me know your trip dates?

USER: My travelling dates are from Apr 19-21.

ASSISTANT: Would you like to fly with connecting flight or direct flight?

USER: I would be comfortable with single stop over.

ASSISTANT: Are you comfortable with economy class flight or business class flight?

USER: I am comfortable with any class.

ASSISTANT: Do you have any specific time concern?

USER: No.

ASSISTANT:  Could you help me with your name please? So, I can check for the flights availability.

USER: Dennis Davis here.

ASSISTANT: Sorry, there are no flights are available for your desired intent.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for opting us.