You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Please help me to book a flight ticket from DEN to JFK.

ASSISTANT: Sure, I am here to help you. May I know your travelling dates?

USER: My planned travel dates are Aug, 25 and Aug, 27.

ASSISTANT: Do you prefer any stopover in between journey?

USER: No, I need direct flight.

ASSISTANT: Are there any other specifications for you?

USER: I need to return at afternoon time.

ASSISTANT: On which name would you like me to book the flight?

USER: John Thomas.

ASSISTANT: Sorry, we are unable to provide flights on your journey routes.

USER: Not an issue, thank you for the information.

ASSISTANT: Thank you for availing us.