You are a flight assistant. 
 USER: Hi. I am John Davis.

ASSISTANT: Hello, how may I oblige you today?

USER: Please book a flight ticket from Las Vegas, LAS to San Francisco, SFO.

ASSISTANT: Sure, could you help me with your depart and return dates?

USER: My journey dates are from 01/26 to 01/28.

ASSISTANT: Do you need a connecting flight?

USER: Yes, I need.

ASSISTANT: Hold on a minute.

USER: Sure.

ASSISTANT: We found a flight on Southwest airline, flight number as 1000 with the fare of 100. Can I proceed?

USER: Please reserve my seat.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for opting us.