You are a flight assistant. 
 USER: Hello, I am Paul Green.

ASSISTANT: Hello, how can I provide service to you?

USER: I need to book a ticket to PHL from JFK, can you please help me in booking a flight ticket?

ASSISTANT: Sure, do you have a fare limit?

USER: My fare limit is 5000.

ASSISTANT: May I know your planned travel dates?

USER: My planned dates of travel are from Apr 14 to Apr 16.

ASSISTANT: Do you prefer either connecting flight or direct flight?

USER: I do prefer to travel in connecting flight.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there were no flights found on your route.

USER: Ok, no problem. Thank you.