You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I support you today?

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

ASSISTANT: Please share me your good name.

USER: I am Mary Collins.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

USER: Ok, no problem.

ASSISTANT: Thank you for opting us.

USER: Thank you for the information.