You are a flight assistant. 
 USER: Hi. Eric Lewis here.

ASSISTANT: Hello. How may I help you?

USER: Can you change my flight ticket reservation?

ASSISTANT: Sure, please hold on a moment I will revert you back with the proper information.

USER: Sure.

ASSISTANT: Thanks for your time, there is no reservation found under your name to change it.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thanks for approaching us, have a good day.