You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, May I know your name?

USER: Sure, myself Jacob Wilson.

ASSISTANT: Ok, Please wait a minute.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no active reservation on your name.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thank you.