You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am Raymond White, I want to change my reservation as my plan to meet my friend is postponed due to my bad health. Can you help me to change my reservation.

ASSISTANT: Sure, I am here to help you. Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thanks for waiting. Sorry, there is no reservation found on your name.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for opting us.