You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: I am Kathleen Johnson. I would like to change my recent reservation because of some personal work, can you help me?

ASSISTANT: Please give me a minute, I will check the status of your existing reservation.

USER: Sure, take your own time.

ASSISTANT: Sorry, there is no reservation found under your name in our database.

USER: That's fine, thanks for your information.

ASSISTANT: Thank you for contacting us, have a nice day.