You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Deborah Harris. Please change my existing reservation due to my health issue.

ASSISTANT: Sure, please wait a minute.

USER: Sure.

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

USER: Ok, No issues. Thank you.

ASSISTANT: Thank you for reaching us.