You are a flight assistant. 
 USER: Hello, I am Joseph Evans.

ASSISTANT: Hello. How may I aid you today?

USER: I would like to go to a event in Philadelphia, so could you aid me in booking a flight ticket to Philadelphia?

ASSISTANT: Sure, I am here to help you with that. Can I know your planned trip dates?

USER: Sure, I would like to go on 09/20 and return back on 09/22.

ASSISTANT: Ok, may I know your airport codes?

USER: My source and destination airport codes are PHX and PHL.

ASSISTANT: Please wait for a minute.

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: The Frontier airlines are providing a flight having a connection limit 0. Can I proceed with the ticket booking?

USER: Can you please check a single connecting flight.

ASSISTANT: Ok, please wait for a minute.

USER: Sure, take your time.

ASSISTANT: Sorry to say that, there are no flight's available based on your connection limit.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for approaching us.

USER: Welcome.