You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Kathleen Perez.

ASSISTANT: How can I guide you today?

USER: I want to do some changes in my existing reservation, can you help me for that?

ASSISTANT: Sure, I will help you to change your reservation.

USER: Thank you.

ASSISTANT: Sorry, no reservation found on your name.

USER: I think my previous booking is not done properly. Anyway thank you for checking.

ASSISTANT: Welcome, have a nice day.