You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: I'm planning to visit Disney world, can you please book the ticket from LAX to DCA?

ASSISTANT: Sure, May I know the travelling dates?

USER: Sure, my planned departure and return travel dates are 20th and 22nd of May.

ASSISTANT: Do you have any connection limit?

USER: I prefer single connected flight.

ASSISTANT: Is there any other requirements?

USER: I want to return in the morning time.

ASSISTANT: May I know your name?

USER: My name is Katherine Nelson.

ASSISTANT: Sorry, No flights found with your chosen dates.

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

ASSISTANT: Thank you for choosing us.