You are a flight assistant. 
 USER: Hello, I am George Moore.

ASSISTANT: Hello, how may I helpful to you?

USER: I have planned a tour with my friends. Due to some personal issues it has been preponed. Could you please change my existing reservation?

ASSISTANT: Sure, please wait for sometime.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found against your name.

USER: Not an issue, thank you.

ASSISTANT: Thank you for connecting us.