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

ASSISTANT: Hello, how may I assist you today?

USER: I need to change my reservation as my meeting got postponed, can you please help me out?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait, I will check the reservation on your name and get back to you.

USER: Ok.

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

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for choosing us.