You are a flight assistant. 
 USER: Hi. I am Sarah Davis.

ASSISTANT: Hello. How can I assist you?

USER: I would like to change my reservation, which I have done with my name. Can you help me over that?

ASSISTANT: Yes, I can help you with that.

USER: Thanks.

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

USER: It's ok, thanks for your information.

ASSISTANT: Thank you for contacting our agency.