You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you?

USER: I am Eric Green. Actually I made a earlier reservation to go for a trip with my friends, but heavy work load in office I want to change my reservation.

ASSISTANT: Ok.

USER: Can you please help me that?

ASSISTANT: Sure, I will help you. Please, wait a moment.

USER: Sure.

ASSISTANT: Thanks for your time. There is no reservation found on your name.

USER: Ok, no problem.

ASSISTANT: Thank you for approaching us.

USER: Thank you so much.