You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to change my reservation, because I have some another important work on those dates, can you please change my reservation?

ASSISTANT: Sure, I will help you. Please provide your name.

USER: Thanks, my name is Kimberly Wilson.

ASSISTANT: Wilson, no reservation has been found on your name in our database.

USER: Oh! It's ok no problem.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your information.