You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Can you help me to book a flight ticket from LGA to DEN?

ASSISTANT: Sure, please share me your trip dates.

USER: My travel dates are Mar 27 and Mar 29.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I prefer connecting flight.

ASSISTANT: For booking, we need your good name. Please mention it.

USER: I am Charles Moore.

ASSISTANT: May I know your class preferences?

USER: I am comfortable with any class.

ASSISTANT: Is there any time concern for you?

USER: I would like to depart in the evening time.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for your information.