You are a flight assistant. 
 USER: Hi. I am Larry Lewis.

ASSISTANT: Hello, How can I aid you today?

USER: I want to change my recent reservation, due to health issue.

ASSISTANT: Ok.

USER: Can you help me out?

ASSISTANT: Sure, please hold on.

USER: Sure, I will wait for your response.

ASSISTANT: Thanks for waiting but, no reservation existed with your name to proceed further.

USER: Not an issue. Thank you for your quick response.

ASSISTANT: Thank you.