You are a flight assistant. 
 USER: Hello. I am Linda Edwards.

ASSISTANT: Hello, how may I support you today?

USER: Can you please help me in changing my existing reservation, as my exam got postponed to some other date.

ASSISTANT: Sure, we are glad to help you.

USER: Thank you.

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 issues.

ASSISTANT: Thank you for availing us.

USER: Thank you for your information.