You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be a help for you?

USER: My name is Scott Wilson. I want to visit Detroit to visit my family, could you help me in booking the ticket?

ASSISTANT: Sure, can you provide the airport codes?

USER: My airport codes are from LAS to DTW.

ASSISTANT: Ok, may I know your travelling dates?

USER: My preferable dates are from 10/21 to 10/23.

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

USER: That's so sad to hear.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your time.