You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: My name is Richard Campbell. Please help me to book a flight ticket from LGA to DEN.

ASSISTANT: Sure, can you please share your travel dates?

USER: My travel dates are from Nov, 04 to Nov, 06.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need a single connecting flight.

ASSISTANT: May I know your airline preference?

USER: I am comfortable with any airline.

ASSISTANT: Which class do you prefer?

USER: I need a economy class.

ASSISTANT: Do you have any specific departure and return time?

USER: I need to depart and return in the evening.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: Sorry, there are no flights in this route as per your travel details.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for choosing us.