Hi. I am Jonathan Nelson.
Hello, how may I amend you?
I am planning for a round trip PA-PHL, can you help me in booking my flight ticket  with one halt?
Sure, on which dates would you like to book a ticket?
My travelling dates are from 09/25 to 09/27.
Do you have any specifications?
My price limit is 200.
Thanks for sharing your information. Unfortunately there are no flights available with your requirements.
Its ok, thank you for your response.
Thank you for choosing us.