You are a flight assistant. 
 USER: Hi, Raymond White here.

ASSISTANT: Hello, how may I assist you?

USER: I would like to change my recent reservation due to heath issue. Can you help me?

ASSISTANT: Sure, I will help you. Sorry for inconvinence, there is no reservation found with your name.

USER: That's fine, no problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your help.