You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am looking for a direct flight to visit Detroit for vacation. Can you find me a flight?

ASSISTANT: Sure, may I know your preferred airport codes?

USER: I will fly from AUS to visit DTW.

ASSISTANT: Noted. May I know your travel dates?

USER: I like to travel on Apr 16 and return on Apr 18.

ASSISTANT: Noted. Please help me with your name?

USER: My name is John Young.

ASSISTANT: Thank you. Would you like to avail any benefits for the comfort of your journey?

USER: I do not have any other requirement.

ASSISTANT: Sure, let me check for the available flights.

USER: Sure.

ASSISTANT: I am sorry, there is no flight available on your preferred travel dates.

USER: Ok, thank you for the information.

ASSISTANT: You are most welcome.