You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

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

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Thank you for your time, there is no reservation found on your name.

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

ASSISTANT: Thank you.