You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Carolyn Walker.

ASSISTANT: How can I assist you, Carolyn Walker?

USER: I need to do some changes in my previous reservation so please help me with changing my reservation.

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Sorry to tell you, Carolyn Walker, there is no reservation found with your name in our reservation list to change.

USER: Oh! It may not be booked properly due to server issue. Anyway, thank you for your time.

ASSISTANT: Thank you for choosing our agency, have a nice day.

USER: Most welcome.