You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Usually I prefer a connecting flight, but unfortunately my friend has already reserved my ticket with a direct flight. So, I want to change it. Will you help me in changing?

ASSISTANT: Sure, may I know your name please?

USER: Sure, my name is Charles Perez.

ASSISTANT: Ok, please wait for a while.

USER: Ok, I will wait.

ASSISTANT: Sorry, there was no reservation found with your name.

USER: No worries, thanks for your assistance.

ASSISTANT: Thank you for opting us.