You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you right now?

USER: I want to change my reservation as I am unwell, can you please help me?

ASSISTANT: Sure, may I know your good name please?

USER: Sure, my name is Jeffrey Thompson.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation matching with your name in our portal to make changes.

USER: Not an issue, thank you for checking.

ASSISTANT: You are welcome.