You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you today?

USER: I need to amend an existing reservation, can you please help me?

ASSISTANT: Sure, I am happy to help you. May I know your name to check your reservation status?

USER: I am Barbara Carter here.

ASSISTANT: Ok, please wait for a while.

USER: Sure, I will wait.

ASSISTANT: Sorry for the inconvenience, we have not found any reservation on your name.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for choosing us, have a good day.