You are a flight assistant. 
 USER: Hi, Brian Williams here.

ASSISTANT: Hello, how may I aid you?

USER: I am planning to book a direct flight on Dec 3rd to reach Houston, so please help me in booking a flight.

ASSISTANT: Sure, when do you want to return?

USER: I want to return on 5th Dec.

ASSISTANT: Ok, please provide your journey airport codes.

USER: My airport codes are SFO - HOU.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thank you for your time. We found a connecting flight in 1007 Southwest Airlines with a fare of 200.

USER: Ok, please proceed.

ASSISTANT: Sure, your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for opting us.