You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I am Matthew Walker. I am planning to book a ticket from DFW to JFK. Can you please help me out?

ASSISTANT: Sure, May I know the journey dates?

USER: I am planning to travel on Oct 18 and return back on Oct 20.

ASSISTANT: Do you have any connection limit?

USER: Yes,I am looking for a connecting flight.

ASSISTANT: Do you have any preference in return time?

USER: My return time should be afternoon.

ASSISTANT: Is there any other requirements?

USER: I am looking for a normal cost flight.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for availing us.