You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I would like to change my reservation due to some health issues, can you please help me out with that?

ASSISTANT: Ok, please can I know your name to check for the reservation?

USER: Myself Anthony Lopez.

ASSISTANT: Thank you for waiting Anthony Lopez, sorry as per our records there is no reservation been found on your name.

USER: That's ok, no problem. Anyway thank you for checking out.

ASSISTANT: Ok, thank you for choosing our agency Anthony Lopez.