You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How can I amend you?

USER: I am Kenneth Green. I want to change my existing reservation due to postpone of our trip date.

ASSISTANT: Ok.

USER: Could you please help me with that?

ASSISTANT: Sure, we are here to aid you.

USER: Thank you.

ASSISTANT: Please, wait for a while I will check the reservation and revert to you.

USER: Sure.

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

USER: Ok, no problem. Thank you for helping me.

ASSISTANT: Thank you for availing us.