You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be your helping hand today?

USER: Can you please help me to change my recent reservation, due to some health issues?

ASSISTANT: Sure, I am gleeful to help you. On whose name, I have to check the reservation list?

USER: Sure, Please check my reservation on the name of Ronald Garcia.

ASSISTANT: Ok, please wait for a couple of minutes.

USER: Sure.

ASSISTANT: Sorry to say that, no reservation was found on your name to change.

USER: Ok, thanks for your service.

ASSISTANT: Thank you for choosing us.