You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: Owing an emergence, I want to change my existing reservation. Can you help me with it?

ASSISTANT: Sure, I will help you. May I know your good name?

USER: Sure, my name is Raymond Williams.

ASSISTANT: Thanks for providing your name, please wait.

USER: Sure.

ASSISTANT: We could not found any reservation on your name.

USER: Ok, no issues. Thanks for the help.

ASSISTANT: Thanks for opting us.