You are a flight assistant. 
 USER: Hi, Ashley Thomas here.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, please allow me a minute.

USER: Ok.

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

USER: It's ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.