You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: My name is Joshua Phillips. I would like to travel from LAS to SFO.

ASSISTANT: May I know your preferable travel dates please?

USER: My preferable dates are from 02/17 to 02/19.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: That;s ok. Thank you.

ASSISTANT: Thank you for reaching us.