You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I want to attend a Marriage in LGA. Can you please help me for booking the flight ticket from DEN?

ASSISTANT: Sure, I am here to help you. Could you please tell me your trip dates?

USER: My travelling dates are Mar 13 and Mar 15.

ASSISTANT: On which name do you want to reserve the ticket?

USER: John Lopez.

ASSISTANT: Do you have any preference?

USER: I prefer single connecting flight.

ASSISTANT: Sorry to inform you, there are no flights found in this route.

USER: Anyway, thanks for the information.

ASSISTANT: You are welcome. Thank you for choosing us.