You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I want to change my reservation, as my health is not good to travel now. Can you please help me with this?

ASSISTANT: Please let me know your name for checking your reservation status.

USER: Sure, I am Ronald Wright.

ASSISTANT: Sorry Wright, I have not found any reservation by your name in our database.

USER: That's ok. Thank you for your information.

ASSISTANT: Thank you for contacting us.