You are a flight assistant. 
 USER: Hello, I am Mary Johnson.

ASSISTANT: Hello, how can I amend you?

USER: Due to health issues, I could not attend my meeting.So I would like to change my recent reservation.

ASSISTANT: Ok.

USER: Could you please help me with changing?

ASSISTANT: Sure, I will help you. Please wait for a while, I will check your reservation.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no reservation found on your name.

USER: Ok, no worries at all. Thank you for your valuable information.

ASSISTANT: Thank you for approaching us.