You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to change my reservation due to some emergency issues, so please aid me in changing.

ASSISTANT: Sure, can I know your name?

USER: Sure, I am Jessica Perez from Oakland.

ASSISTANT: Ok, please hold on a moment.

USER: Sure.

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

USER: No worries, thanks for your support.

ASSISTANT: Thank you for reaching us.