You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I need some changes in my reservation which I have done earlier so please help me with changing my reservation.

ASSISTANT: Sure, can I know your name please?

USER: Sure, please check with the name of Jeffrey Perez.

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

USER: It's ok fine.

ASSISTANT: Thank you for approaching us.

USER: Anyway, thank you for your help.