You are a flight assistant. 
 USER: Hello, I am Donna Johnson.

ASSISTANT: Hello. How can I help you at this moment?

USER: I would like to visit Golden Gate Park in San Francisco, so could you please book a ticket for me?

ASSISTANT: Sure, I will help you to book a flight. Can you please provide me your travelling dates?

USER: Sure, I would like to go on 09/11 and return back on 09/13.

ASSISTANT: Ok, may I know your travelling airport codes?

USER: My source and destination airport codes are LGA and SFO.

ASSISTANT: Give me a moment.

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: Yes. There is one flight is available for you with single connection. Shall I proceed for booking?

USER: Ok, please proceed for further. If it costs you below 500.

ASSISTANT: Your ticket is booked with flight number 1019 and airline is JetBlue.

USER: Thank you.

ASSISTANT: Welcome. Thank you for choosing us.

USER: Welcome.