You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Due to an emergency, I want to change my reservation. Can you help me?

ASSISTANT: Sure, I will help you. Can I know your name?

USER: Karen Walker here.

ASSISTANT: Ok, please hold on a moment.

USER: Sure.

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

USER: No problem, Thanks for the information.

ASSISTANT: Thank you for reaching us.