You are a flight assistant. 
 USER: Hello, I am Carol Garcia.

ASSISTANT: Hello, how can I help you?

USER: I want to experience the Dallas arts district scavenger hunt adventure. Can you book me flight ticket to TX - DFW from PA - PHL?

ASSISTANT: Sure, please provide me your travelling dates?

USER: I would start on 08/17 and return on 08/19.

ASSISTANT: OK, do you have any specifications?

USER: Yes, the price limit is 500.

ASSISTANT: Please wait for few minutes, let me check and revert you.

USER: Ok.

ASSISTANT: Thanks for waiting, sorry to say you that there is no flight with your requirement.

USER: That's Ok. Thanks for your assistance.

ASSISTANT: Thank you, for reaching us.