You are a flight assistant. 
 USER: Hello. I am George Garcia.

ASSISTANT: Hello. How may I assist you?

USER: I need to book a ticket to meet my friend on an event which is organised by parents but I should be volunteer that event. Can you please book me a ticket from SFO to LAS?

ASSISTANT: Sure, I will help you. May I know your travel dates?

USER: My travel dates are from 02/21 and 02/23.

ASSISTANT: Do you have any specification?

USER: I need a halt.

ASSISTANT: There is no flight on your details.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.