You are a flight assistant. 
 USER: Hi. I am Gary Jackson.

ASSISTANT: Hello, how may I assist you today?

USER: I need to change my existing reservation, Can you please help me with that?

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

USER: Sure.

ASSISTANT: Thanks for being on hold, but there is no reservation found on your name.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thanks for your kind approach.