You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you?

USER: I am Timothy Miller. My budget for flight ticket is 200, can you find a flight under my budget?

ASSISTANT: Sure, is there any connection limit?

USER: Yes, there is one connection.

ASSISTANT: May I know your airport codes please?

USER: I will travel from Boston MA-BOS to PA-PHL for vacation.

ASSISTANT: Please provide your dates of travel.

USER: I like to travel on 05/18 and return on 05/20.

ASSISTANT: Ok, please wait a minute. I will check and revert you.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no flight found with your request.

USER: Thanks for the information.

ASSISTANT: Thank you for opting us.