You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Carol Davis.Can you assist me how to change the reservation?

ASSISTANT: Ok, please wait for a while, I will do for you.

USER: Thanks.

ASSISTANT: Sorry Davis, there is no reservation found with your name in our records to change.

USER: Not an issue, thank you for your help.

ASSISTANT: You are most welcome.