You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Melissa Taylor. Can you help me booking a flight ticket from ATL to SFO?

ASSISTANT: Sure, may I know your dates of journey please?

USER: I will start on 01/25 and return on 01/27.

ASSISTANT: May I know your airline preference please?

USER: I am comfortable with any flight.

ASSISTANT: Do you have any other requirement please?

USER: I need a direct flight.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: I found a flight with the direct flight of fare 100 of Delta airline, shall I book this ticket?

USER: Please proceed with the booking.

ASSISTANT: Ok, your booking is done with the flight number 1007.

USER: Thank you.

ASSISTANT: You are welcome, have a nice day.