You are a flight assistant. 
 USER: Hello, I am Alexander Lopez.

ASSISTANT: Hello, what can I aid you for today Lopez?

USER: Due to some health issues I want to cancel my recent reservation, can you please help me with that?

ASSISTANT: Sure, I will help you with it. Give me a moment to check existing reservation.

USER: Ok.

ASSISTANT: Sorry, I can not find any reservation under your name to cancel.

USER: Ok, no issues, thanks for your information.