You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I want to book a ticket from SFO to ATL. Could you book a ticket?

ASSISTANT: Sure, can you please share me with your dates of journey?

USER: Departure date is May, 19 and return date is May, 21.

ASSISTANT: May I know your name please?

USER: My name is Helen Harris.

ASSISTANT: Helen, there is a flight with the connecting flight of fare 100 and the airline is naming as UA, are you ok?

USER: Proceed for booking.

ASSISTANT: Ok, your booking is done with the flight number 1004.

USER: Thanks.

ASSISTANT: You are welcome, have a safe flight.