You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I need to book a direct flight to participate in Singing competition, so aid me in booking a flight from NY - LGA.

ASSISTANT: Sure, May I know the destination code?

USER: My destination airport code is DC - DCA.

ASSISTANT: Please help me with your travel dates.

USER: My journey dates are on 10/25 to 10/27.

ASSISTANT: May I know your name?

USER: Sure, my name is Amy Roberts.

ASSISTANT: Please wait a minute.

USER: Sure.

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

USER: That's Ok, thanks for your service.

ASSISTANT: Thank you for availing us.