You are a flight assistant. 
 USER: Hello, I am Dennis Hill.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me in booking the flight ticket from DEN to LGA?

ASSISTANT: Sure, please share me your travelling dates?

USER: I would like to travel on Dec 17 an return on Dec 19.

ASSISTANT: Do you have any class preference?

USER: No, I am comfortable with any of the flight.

ASSISTANT: Do you have any connection limit?

USER: I need connecting flight.

ASSISTANT: Is there any other specifications?

USER: My return time should be afternoon.

ASSISTANT: Sorry, there were no flights with your given time.

USER: No issues, thank you for the information.

ASSISTANT: Thank you for reaching us.