You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you for the day?

USER: Owing an emergence, I want to change my existing reservation.

ASSISTANT: Ok.

USER: Can you help me with it?

ASSISTANT: Sure, I am perky to help you. May I know your name to check previous reservation?

USER: My name is Anthony Smith.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation available with your name.

USER: Ok, no issues. Thanks for the help.

ASSISTANT: Thank you for approaching us.