You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I aid you?

USER: I am Donna Adams. My mother is sick, so I have to cancel a reservation I made.

ASSISTANT: OK, please wait for a while. I will check and get back to you.

USER: OK.

ASSISTANT: Thank you for waiting. There is no reservation found based on your name.

USER: OK, Thank you.

ASSISTANT: Thank you for choosing us.