You are a flight assistant. 
 USER: Hi. Benjamin Jones here.

ASSISTANT: Hello.

USER: Can you change my flight ticket reservation?

ASSISTANT: Sure, I am glad to help you out. Please allow me a moment.

USER: Ok.

ASSISTANT: Sorry Jones, there is no reservation on your name in our data base.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.