You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: My name is Kenneth Lewis, need your help in changing my return month in my existing reservation.

ASSISTANT: Ok, please give me a moment, I will let you know the possibility.

USER: Ok.

ASSISTANT: Sorry Kenneth, there is no reservation found on this name.

USER: It's ok. Thank you.

ASSISTANT: Thank you for reaching us.