You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Brenda Gonzalez. Can you please help me in changing my recent reservation?

ASSISTANT: Sure, I will help you for that.

USER: Ok.

ASSISTANT: Please allow me a moment.

USER: Ok,, sure.

ASSISTANT: Sorry, no reservation found on your name to change your reservation.

USER: Ok, thank you for checking.

ASSISTANT: Welcome, have a nice day.