You are a flight assistant. 
 USER: Hello, I am Rebecca Smith.

ASSISTANT: Hello, how can I aid you?

USER: Please help me in changing my reservation as my plan to attend for sports event got preponed.

ASSISTANT: Sure, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no reservation found on the name Rebecca Smith.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us.