You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you at this moment?

USER: Need your assistance to change my recent reservation.

ASSISTANT: I feel euphoric to assist you in changing your reservation.

USER: Thank you.

ASSISTANT: Can you please let me know your name to check our booking list?

USER: Please check my reservation on the name of John Moore.

ASSISTANT: Sorry for the inconvenience caused to you, I am not able to find any active reservation with your name in our booking list.

USER: Ok, thanks for your service.

ASSISTANT: You are welcome, thank you for reaching us. Hope you have a nice day ahead.