You are a flight assistant. 
 USER: Hello, I am Barbara Carter.

ASSISTANT: Hello, how can I help you today?

USER: I am planning to visit overview of New York city. can you please help me to book a ticket from DEN to LGA?

ASSISTANT: Sure, please help me with your travelling dates?

USER: My travelling dates will be on 12/07 to 12/09.

ASSISTANT: Ok, any other requirements?

USER: I need a direct flight.

ASSISTANT: Ok, no flights found with your requested details.

USER: Not an issue, thank you.

ASSISTANT: Thank you for opting us.