You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Jonathan Clark. I need to amend my reservation, can you help me out please?

ASSISTANT: Sure, I am here to help you. Please wait, let me check your reservation status.

USER: Sure.

ASSISTANT: Clark, I have not found any reservation under your name in our database.

USER: That's ok, no problem. Thank you for your information.

ASSISTANT: You are most welcome and have a nice day.