You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Paul Harris.

ASSISTANT: How can I help you?

USER: Can you please help me to reserve a flight ticket from New York to Philadelphia?

ASSISTANT: Sure, I will help you to book a flight ticket. Can you please share me your travelling dates?

USER: Thank you. I am willing to travel on the dates of May 26 and May 28.

ASSISTANT: Ok, may I know your airport codes?

USER: The origin and destination airport codes are JFK and PHL.

ASSISTANT: Do you have any connection limit?

USER: I prefer only the direct flight to travel.

ASSISTANT: Ok, may I know your arrival and departure time?

USER: I have a preference about the departing time that should be in the afternoon.

ASSISTANT: Sorry, no flights are available on your route.

USER: Oh! It is sad to hear from your end. Anyways thank you for your time.

ASSISTANT: Welcome, have a nice day. Thank you for choosing us.

USER: You are welcome.