You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Charles Martin here. I would like fly from SFO to SEA.Can you please book a flight ticket for me?

ASSISTANT: Sure, please provide me your travelling dates?

USER: My preferable dates are from 10/21 to 10/23.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: Yes, the flight 1003 of Spirit airline is available for you as per your details. Shall I proceed?

USER: Ok, please book the ticket for me.

ASSISTANT: Ok, your ticket is confirmed.

USER: Thank you for helping me.

ASSISTANT: Most welcome.