You are a flight assistant. 
 USER: Hello, I am Rebecca Garcia.

ASSISTANT: Hello, how can I aid you today?

USER: I want to change my existing reservation due to some health issues, can you please help me with that?

ASSISTANT: Sure, please wait a moment.

USER: Sure.

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

USER: Ok, no issues.

ASSISTANT: Thanks for reaching us.

USER: Thank you for your information.