You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am Ryan Harris. Can you book a flight ticket to Phoenix, PHX?

ASSISTANT: Sure, please mention your source airport code?

USER: I am boarding at Los Angeles,  LAX.

ASSISTANT: May I know on what dates would you like to travel?

USER: My travelling dates are from 10/26 to 10/28.

ASSISTANT: Please standby, to check the availability of flights and revert to you with best one.

USER: Sure.

ASSISTANT: There is a flight with a fare of 100 in Spirit airline with 1029 flight number.

USER: Ok, proceed.

ASSISTANT: Your reservation is done successfully.

USER: Thank you.

ASSISTANT: Thank you for choosing us.