You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to book a flight ticket having a connection limit 0. Can you please help me to book a flight ticket from Dallas?

ASSISTANT: Sure, may I know your airport codes?

USER: Yes, my source code is TX - DFW and destination is PA - PHL.

ASSISTANT: Ok, please tell me your travelling dates.

USER: My travelling dates are 12/22 and 12/24.

ASSISTANT: Ok, may I know your name please?

USER: Yes, I am Matthew Hall.

ASSISTANT: Hall, no flights found as per your request. Do you need any other help?

USER: No, I do not have any requirements. Its ok, I will go with another resources to reach my destination.

ASSISTANT: Ok, thank you for connecting with us.

USER: Most welcome.