You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: Can you help me to change my existing reservation as my exam dates got postponed?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your good name please?

USER: Sure, I am Sharon Parker.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry to inform you that, there is no reservation found as per your name in our database.

USER: Ok, not a problem. Thank you.

ASSISTANT: You are welcome.Thank you for reaching us with a query.