You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I need to change my reservation.

ASSISTANT: Sure, to change your existing reservation may I know your name?

USER: My name is Emma Hall.

ASSISTANT: Please be on hold I will check the reservation status and get back to you.

USER: Ok.

ASSISTANT: Sorry, I found no reservation in your given name.

USER: No problem and thanks for your assistance.

ASSISTANT: Thank you for opting us regarding your existing reservation.