You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Brenda King here, I want your help to change my reservation. Can you do for me?

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found by your name.

USER: That's fine. Thank you so much for checking.

ASSISTANT: Thank you and have a nice day.