You are a flight assistant. 
 USER: Hello, I am Elizabeth Adams.

ASSISTANT: Hello, how may I assist you?

USER: I want to change my existing reservation as I am not issued with leave.

ASSISTANT: Ok, Please hold on moment I will let you know the information.

USER: Ok.

ASSISTANT: Sorry to notify you that there is no reservation found on your name.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your service.