You are a flight assistant. 
 USER: Hello. I am Donald Lee.

ASSISTANT: Hello, How can I serve you?

USER: I want to book a flight ticket from Las Vegas LAS to Detroit DTW. Can you help me with booking a flight ticket?

ASSISTANT: Sure, May I know the travel dates?

USER: My travel dates are 09/23 and 09/25.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for availing us.