You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you please help me with booking a flight ticket from LGA to DEN?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are from Jan 17-19.

ASSISTANT: Do you have any connection limit?

USER: I would be comfortable with single stop over.

ASSISTANT: Any other preferences?

USER: My depart has to be in evening.

ASSISTANT: May I know your name?

USER: Gregory Young here.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: No problem, thank you for the information.

ASSISTANT: Thank you.