You are a flight assistant. 
 USER: Hello, I am Donald Lewis.

ASSISTANT: Hello. what can I do to make your experience better with us?

USER: To attend a live concert at Seattle. I would like to travel from Philadelphia. Can you help me book a flight ticket within the price of 500?

ASSISTANT: Sure, do you need a halt within your journey?

USER: Yes, I need a stopover.

ASSISTANT: Kindly mention your planned travelling dates to proceed further.

USER: I will depart on 03/04 and end on 03/06.

ASSISTANT: Can I know your source and destination points?

USER: My trip is from PHL to SEA.

ASSISTANT: Please wait a moment I will check and revert to you.

USER: Sure.

ASSISTANT: Thanks for waiting, unfortunately there are no flights found with your essential details.

USER: That's ok, thank you for the response.

ASSISTANT: Thanks for choosing us.