You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Eric Thomas.

ASSISTANT: How can I assist you Eric?

USER: I need to change my existing reservation as my college function got postponed, Can you please help me with that?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for a couple of minutes.

USER: Sure.

ASSISTANT: Sorry Eric Thomas, no reservation found on your name in our reservation list.

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

ASSISTANT: Thank you for opting us, have a nice day.