You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Myself John Parker. I want to change my existing reservation, can you help me in that?

ASSISTANT: Sure, I am here to help you. Please give me a moment to check your reservation status.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting. Sorry, there is no reservation found on your name in our records.

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

ASSISTANT: Thank you for reaching us.