You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Debra Phillips. I want to change my reservation due to my bad health condition from last night.

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, no reservation found with your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for choosing us.