You are a flight assistant. 
 USER: Hello, Sarah Collins here.

ASSISTANT: Hello, how may I assist you?

USER: I planned to attend for an event in DTW, can you please help me to book a flight ticket from ORD?

ASSISTANT: Sure, I will help you out. Please me your travel dates?

USER: I planned to travel on 11/27 and 11/29.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry Collins, no reservation found on your name in our data base.

USER: OK, thank you for your information.

ASSISTANT: Sorry, no flight available in your route. Thank you for reaching us.