You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER:  I am Sharon Roberts, I would like to change my recent reservation because of some personal issue, can you help me to change that reservation?

ASSISTANT: Yes, I can help you.

USER: Thank you.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: That's fine, thanks for your information anyways.

ASSISTANT: Thank you for consulting us.