You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER:  I am Kevin Allen want to change my reservation due to some health issues. Can you help me in changing my reservation?

ASSISTANT: Sure, wait a minute.

USER: Ok.

ASSISTANT: There is no reservation found on a your name.

USER: Thank you for providing information.

ASSISTANT: Thank you for reaching us.