You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. how can I help you?

USER: I want to change my reservation due to health problem, can you help me?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Can you please provide the name.

USER: Myself Andrew Scott.

ASSISTANT: Sorry, there is no reservation found by your name.

USER: No problem, thanks for checking.

ASSISTANT: Thank you and have a nice day.