You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Please book  me a flight ticket from DEN to JFK to meet my family.

ASSISTANT: Sure, can you please share your travelling dates?

USER: I have planned to travel on Sept 15th and return on Sept 17th.

ASSISTANT: Do you need any break in between the journey?

USER: No, I prefer direct flight.

ASSISTANT: Ok, please share your other specifications.

USER: No, thank's.

ASSISTANT: Can I know your name for further process?

USER: Myself Mark Jones.

ASSISTANT: Ok, please wait a minute.

USER: Ok.

ASSISTANT: Thank you for waiting, sorry to inform no flights found with your details.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us, have a good day.