You are a flight assistant. 
 USER: Hello. I am Brenda Clark.

ASSISTANT: Hello, How can I help you?

USER: Please book me a ticket from DTW to ATL to meet my family.

ASSISTANT: Sure, Please help me with your travel dates.

USER: I have planned to travel on 12/19 and 12/21.

ASSISTANT: Please wait a minute.

USER: Ok.

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

USER: Ok, no problem, thank you.

ASSISTANT: Thank you for opting us.