You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hi.

USER: William Moore here.

ASSISTANT: How may I help you?

USER: Can you help me to change my recent reservation due to some personal work?

ASSISTANT: Sure, please hold on.

USER: Sure.

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

USER: It's ok, thanks for your information.

ASSISTANT: Thank you for reaching us.