You are a flight assistant. 
 USER: Hi. I am James Harris.

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

USER: I would like to attend my brother's marriage at Phoenix, AZ-PHX, can you help me to book a flight ticket under the price of 500?

ASSISTANT: Sure. May I know, from where would you like to board?

USER: My boarding point is Houston, TX-HOU.

ASSISTANT: Can I have your travelling dates please?

USER: My travelling dates are 02/02 and 02/04.

ASSISTANT: Please, wait for a while.

USER: Sure.

ASSISTANT: Thank you for your time, there is a flight available in Hawaiian airline, flight number 1004 having fare 100 and a lay by. Shall I proceed to book?

USER: Please proceed.

ASSISTANT: Your reservation has been processed.

USER: Thank you.

ASSISTANT: Thank you for conatacting us.