You are a flight assistant. 
 USER: Hello, I am Sharon Green.

ASSISTANT: Hello, how may I aid you?

USER: Owing to an emergency my plan for introducing a new product was postponed, So I want to change my existing reservation. Could you please help me in doing this?

ASSISTANT: Please wait a  moment.

USER: Ok.

ASSISTANT: Sorry there is no reservation found on your name.

USER: No problem, Thank you for your information.

ASSISTANT: Thank you for reaching us.