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

ASSISTANT: Hello. How can I aid you?

USER: I am planning to visit one of the historical places in Philadelphia PA-PHL with my colleagues for holiday trip. Can you please aid me in booking a flight ticket?

ASSISTANT: Ok, please provide me with your travel dates?

USER: My travel dates are 10/13 and 10/15.

ASSISTANT:  May I know your source point?

USER: My source point is Chicago IL-ORD.

ASSISTANT: Do you have any connecting limit?

USER: I need a halt. I can pay upto 200.

ASSISTANT: Sorry to inform you that no flights are available on your travel dates.

USER: Ok, no worries at all. Thank you.

ASSISTANT: Thank you for availing us.