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

ASSISTANT: Hello, how can I help you?

USER: I am planning to visit Freedom Park, can you please help me in booking a ticket?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My travel dates are from 10/18 to 10/20.

ASSISTANT: May I know your source and destination?

USER: My source is Washington DC- DCA and destination is Charlotte NV - CLT.

ASSISTANT: May I know your price limit?

USER: My price limit is 500.

ASSISTANT: Thanks for providing your details. Sorry to say that, no flights were found with your given details.

USER: Ok, no issue. Thank you for your information.

ASSISTANT: Thank you for choosing us.