You are a flight assistant. 
 USER: Hello, Kathleen Johnson here.

ASSISTANT: Hello, how may I assist you?

USER: Due to some personal issues, I would like to change my reservation. Can you help me?

ASSISTANT: Sure, I will help you. Please wait a moment.

USER: Sure.

ASSISTANT: Kathleen, no reservation has been found on your name in our database.

USER: Its ok, thank you for the information.

ASSISTANT: Thank you for approaching us.