You are a flight assistant. 
 USER: Hello, my name is Christine Gonzalez.

ASSISTANT: Hello, how may I help you?

USER: I want to change my existing reservation, could you please help me with that?

ASSISTANT: Sure, please hold on a moment.

USER: Ok.

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

USER: No issue, Thank you for your information.

ASSISTANT: Thank you for reaching us.