You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide  you for the day?

USER: My name is Larry Roberts. I am looking to book a flight ticket from LAS to DTW to meet my friend. Can you help me for booking a flight ticket?

ASSISTANT: Sure, I am here to help you with that flight ticket booking. Can you please provide your planned travel dates?

USER: My travelling dates are 12/21 and 12/23.

ASSISTANT: Please hold for a moment.

USER: Sure, I will wait for your response.

ASSISTANT: That you for waiting, but I am sorry to tell you that, there is no  flight that is moving to your region to book a flight ticket.

USER: That's ok, thank you for checking.

ASSISTANT: You are most welcome, thank you for reaching our agency.

USER: Welcome.

ASSISTANT: Have a nice day.