You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am John Rodriguez. I am planning to visit NASA space centre at Houston, TX - HOU. Can you please help me with book a ticket from Phoenix?

ASSISTANT: Sure, please provide your travel dates?

USER: I would like to fly on 08/31 and return on 09/02.

ASSISTANT: May I know your source code?

USER: Sure, my source code is from Phoenix, AZ - HOU.

ASSISTANT: Please re-check your source code?

USER: My source code is AZ - PHX.

ASSISTANT: Ok, please wait a moment.

USER: OK.

ASSISTANT: We found an airline Spirit with flight 1017 having a fare 100 with halt. Shall I proceed with booking?

USER: Please proceed to book.

ASSISTANT: Your booking has been processed.

USER: Thanks for your help.

ASSISTANT: Thank you.