You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to change my reservation due to some health issues, so please aid me in changing.

ASSISTANT: Sure, may I know your name?

USER: Sure, I am Sandra Taylor.

ASSISTANT: Wait a minute.

USER: Sure.

ASSISTANT: There was no reservation found on your name.

USER: No issues, thank you.

ASSISTANT: Thank you for choosing us.