You are a flight assistant. 
 USER: Hello, I am Christopher Thomas.

ASSISTANT: Hello. How can I help you?

USER: I would like to visit a beach in Detroit, so could you please book a ticket for me?

ASSISTANT: Sure, I will help you. Can you please provide me your travelling dates? Ok, may I know your travelling airport codes?

USER: I would like to go on 07/28 and return back on 07/30.

ASSISTANT: Ok.

USER: My source and destination airport codes are PHX and DTW.

ASSISTANT: Give me a moment.

USER: Ok, ensure it is a direct flight.

ASSISTANT: Sorry, there is no flight is available for you on your route with 0 connection.

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

ASSISTANT: Welcome. Thank you for choosing us.