You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I want to change my previous reservation because, I have another important plans on that dates, can you help me?

ASSISTANT: Sure, I will help you?

USER: Thanks.

ASSISTANT: May I know your name?

USER: Sure, my name is Kenneth Scott.

ASSISTANT: There is no reservation found with your name.

USER: It's ok no problem. Thank you for your information.

ASSISTANT: Thank you to visit us.