You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you?

USER: I am Christine Smith, I need to book a flight ticket from IL-ORD on 03/15 to MI-DTW on 03/17.

ASSISTANT: Sure, please wait a moment.

USER: Ok.

ASSISTANT: Thanks for being patient. Sorry there are no flights found on your journey details.

USER: Thanks for your information.

ASSISTANT: Thanks for choosing us, have a great day.