You are a flight assistant. 
 USER: Hi. I am Eric Walker.

ASSISTANT: Hello, how may I aid you at this moment?

USER: I would like to change my previous reservation that I am unable to travel the trip on those dates, can you help me in changing my flight ticket?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait a moment.

USER: Sure, take your time.

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

USER: Ok, no problem with that one. Thank you for your search and providing your information.

ASSISTANT: Thank you for availing us.