You are a flight assistant. 
 USER: Hello, I'm Paul Green.

ASSISTANT: Hello, how may I aid you?

USER: I want a flight ticket from LAS to HOU, can you please book a ticket if it is available?

ASSISTANT: Sure, please provide your travel dates?

USER: I would like to travel on 09/23 and return on 09/25.

ASSISTANT: There is no flight available, Paul. Do you want to know anything else?

USER: No thanks. Thank you.

ASSISTANT: Thanks for contacting us.