You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I need to change my reservation which I have done to enjoy vacation holidays but suddenly leaves got postponed so please help me with that.

ASSISTANT: Sure, I can help you with that.

USER: Thank you.

ASSISTANT: May I know your name for checking your previous reservation status?

USER: Sure, myself Kenneth Perez.

ASSISTANT: Ok, please wait a moment.

USER: Sure, take your time.

ASSISTANT: There is no previous reservation available on your name Kenneth Perez.

USER: It's ok fine, no issues. Thank you for your time.

ASSISTANT: Thank you for reaching us, have a good day Kenneth Perez.

USER: Most welcome.