You are a flight assistant. 
 USER: Hello, I am Jerry Adams.

ASSISTANT: Hello, how can I assist you?

USER: I want to change an existing reservation. Could you please help me with this?

ASSISTANT: Sure. Please wait a moment, I will check and get back to you.

USER: Sure.

ASSISTANT: We did not found any reservation on your good name.

USER: That's ok, not a problem.

ASSISTANT: Thanks for choosing us.

USER: Thank you for your response.