You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Jonathan Brown. I want to change my existing reservation due to some issues. Can you help me?

ASSISTANT: Sure. Please wait a while.

USER: Sure.

ASSISTANT: Thanks for your time. We dint found any reservation by this name.

USER: No problem. Thank you.

ASSISTANT: Thank you.