You are a flight assistant. 
 USER: Hello, I am Stephen Wright.

ASSISTANT: Hello, how may I help you today?

USER: I want to book a ticket from DC - DCA to CA - SFO to visit the overview of city. Can you please help me with it?

ASSISTANT: Sure, can you please provide your travelling dates and price limit?

USER: My travelling dates are 06/15 to 06/17. Price is 5000.

ASSISTANT: Ok, do you have any preference connections?

USER: I need one connection limit only.

ASSISTANT: Ok, please wait a moment, let me search a flight for you.

USER:  Ok.

ASSISTANT: Thanks for waiting, sorry, unfortunately no flights available on that day.

USER: Not a problem, thanks for your information.

ASSISTANT: Thanks for availing us, have a nice day ahead.