You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Kimberly Clark. I want to change my existing reservation, can you please help me with this?

ASSISTANT: Sure, I can help you in that flight ticket changing. Please allow me a moment to check in our previous booking list.

USER: Sure, take your time.

ASSISTANT: As per your request, I have checked and it is showing that no reservation has found on the user name that you have provided for checking.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching our agency, have a great day.