You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I oblige you today?

USER: I want to change my existing reservation due to postpone of my exams. Can you please help me in that?

ASSISTANT: Sure, can I know your good name?

USER: Myself Angela Moore.

ASSISTANT: Please hold a moment.

USER: Ok.

ASSISTANT: Thank you for waiting, there is no active reservation found with the given name.

USER: Ok, not an issue. Thank you for checking.

ASSISTANT: Thank you for reaching us.