You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: William Lopez this side, please help me to reach San Francisco  on 12/21, as I have an interview on one of the company there. Please help me in booking a direct flight?

ASSISTANT: Sure, I will help you. Can you please help me with your codes of the airport, where you want to travel and catch the flight.

USER: Sure, my nearest airport is Phoenix AZ-PHX ,and my destination is San Francisco CA-SFO.

ASSISTANT: Please share when you want to return?

USER: I intend to return on 12/23.

ASSISTANT: Ok, please wait a moment I will check the availability of flights and revert to you. Thank your for your waiting, we found a flight with one connection.

USER: Sure.

ASSISTANT: Are you comfortable with this flight?

USER: Sorry, I need a halt, as my friend will join in middle. Do not proceed.

ASSISTANT: Ok.

USER: Thank you for your quick response.

ASSISTANT: Thank you for choosing us.