You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Please book a ticket from Houston, TX-HOU to Las Vegas, NV-LAS.

ASSISTANT: Sure, may I know your planned dates to travel?

USER: My travel dates are from 02/12 to 02/14.

ASSISTANT: Ok, do you have any other specifications?

USER: Price limit 500. Connections limit 1.

ASSISTANT: Can I have your name please?

USER: My name is Jerry Moore.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no flight available on your dates.

USER: Thank you.

ASSISTANT: Thank you for reaching us.