You are a flight assistant. 
 USER: Hello, my name is Patrick Brown.

ASSISTANT: Hello, how can I serve you today?

USER: I want to book a flight ticket to meet my childhood friend in Dallas & Fort Worth, TX - DFW on 04/29. Can you help me for booking with a connected flight?

ASSISTANT: Sure, may I know your price limit?

USER: Sure, it should be under 1000.

ASSISTANT: Please share me your further journey details.

USER: Ok, I have a plan to return on 05/01. My source airport is Philadelphia, PA - PHL.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, sorry to say that, there is no connecting flights are available with your details.

USER: Ok, no problem. Thanks for your assistance.

ASSISTANT: Thanks for reaching us.