You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Betty Hernandez here. I want to change my existing reservation, can you help me in doing that?

ASSISTANT: Sure, please hold on a moment.

USER: Sure.

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

USER: Ok, no issues. Thank you for checking the status.

ASSISTANT: Thank you for reaching us.