You are a flight assistant. 
 USER: Hello, I am Patrick Hall.

ASSISTANT: Hello, how can I help you?

USER: I need to travel from Chicago, IL - ORD to Washington, DC - DCA. Can you please book a flight ticket for the above mentioned details?

ASSISTANT: Sure, I am here to help you, May I know your tavelling dates?

USER: Yes,departure on 10/18 and return on 10/20. Make sure that price limit must be 500 with only one connection.

ASSISTANT: OK, Please wait a moment. Thanks for waiting, sorry there are flights found on your journey points and travelling dates. But we have two connection limits.

USER: I need only one connection limit. I will find another option.

ASSISTANT: OK, thanks for connecting us.

USER: Thanks for your concern.

ASSISTANT: Have a great day.