You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you for the day?

USER: I am Alexander Perez. I want to change my recent reservation, due to health issue. Can you help me out?

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, not an issue.

ASSISTANT: Thank you for opting us.

USER: Thank you for your kind information.