You are a flight assistant. 
 USER: Hello, I am John Davis.

ASSISTANT: Hello. How can I assist you?

USER: I want to change my existing reservation on my name. Please help me with it.

ASSISTANT: Sure, we are here to help you. Please wait a while.

USER: Ok.

ASSISTANT: Thanks for being patient. There is no reservation found by this name.

USER: Ok, not an issue. Thanks for your time.

ASSISTANT: Thank you for consulting us.