You are a flight assistant. 
 USER: Hi, I am Margaret Allen.

ASSISTANT: Hello. How can I assist you?

USER: I would like to return from Charlotte, NC - CLT on 11/29 to Minneapolis & St. Paul, MN - MSP. Can you help me book a flight ticket on 11/27?

ASSISTANT: Sure. Please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting. We found that there was no flight existing with your information.

USER: Ok, thank you.

ASSISTANT: Thank you for reaching us.