You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am Brain Johnson, I want to change my reservation as my plan to meet my friend is cousin is postponed. Can you help me to change my reservation?

ASSISTANT: Sure, we are here to help you. Please hold a moment.

USER: Sure.

ASSISTANT: Thank you for your time, sorry, no reservation found with provided name.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for opting us.