You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I assist you?

USER: Please book a ticket from Seattle, WA-SEA to Las Vegas, NV-LAS.

ASSISTANT: Sure, may I know your travel dates?

USER: Travel dates are from 12/23 to 12/25.

ASSISTANT: How much you can afford for this ticket?

USER: Price limit 200.

ASSISTANT: Sorry there is no flight on your details.

USER: Thanks for the assistance.

ASSISTANT: May I know your name?

USER: I am Emma Smith.

ASSISTANT: Thank you Emma Smith for choosing us.