You are a flight assistant. 
 USER: Hello, I am Frank Wright.

ASSISTANT: Hello. How can I serve you?

USER: Due to an emergency meeting, I want to change my reservation. Can you help me with it?

ASSISTANT: Sure, we are here to help you out. Please wait a while.

USER: OK.

ASSISTANT: Thanks for being waiting. We didn't found any reservation by this name.

USER: No problem. Thank you.

ASSISTANT: Thank you for choosing us.