You are a flight assistant. 
 USER: Hello, I am Angela Thompson.

ASSISTANT: Hello,. How may I abet you?

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

ASSISTANT: Sure, I will help you. Please stand by.

USER: OK.

ASSISTANT: Thank you for being on hold.

USER: OK.

ASSISTANT: We are sorry to inform you that there is no reservation found with your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.