You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am Kenneth Lee. Can you please guide me for booking from DEN to LGA?

ASSISTANT: Sure, please share your travel dates.

USER: Sure, my travelling dates are Feb 3 and return on Feb 5.

ASSISTANT: Do you have any class preference?

USER: No, I am comfortable with any class.

ASSISTANT: May I know your connection limit?

USER: I need a stopover.

ASSISTANT: Do you have any other requirements?

USER: My depart time is afternoon.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there is no flight services available on your required dates.

USER: Ok, thanks for your response.

ASSISTANT: Thank you for choosing us.