You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be your helping hand today?

USER: I am Brandon Lee. Could you help me in booking a flight ticket from Las Vegas to San Francisco on 07/17?

ASSISTANT: Sure, I am perky to help you. May I know your return date please?

USER: I want to return on 07/19.

ASSISTANT: Ok, please assign your selected airport codes.

USER: My source and destination airport codes are NV - LAS to CA - SFO.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time, we found a connecting flight with a fare of 400 in Delta airline. Shall I proceed?

USER: You can proceed to booking.

ASSISTANT: Ok, your ticket has been confirmed and the flight number is 1029.

USER: Thank you.

ASSISTANT: Thank you for reaching us.