You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to change my existing reservation due to some health issue. Can you help me?

ASSISTANT: Sure, kindly mention your name.

USER: Sure, I am Shirley Rodriguez.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry to inform, no reservation found with your name.

USER: That's fine, no problem. Thank you for your information.

ASSISTANT: Thanks for reaching us.