You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Usually I prefer a connecting flight, but unfortunately my friend has already reserved my ticket with a direct flight. So, I want to change it. Can you please change my reservation?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Let me know that, on which name reservation has been done?

USER: Sure, I am Shirley Carter.

ASSISTANT: Please wait a minute, let me check the reservation status and get back to you.

USER: Sure.

ASSISTANT: We could not found your reservation in your database.

USER: Ok. Thank you for your service.

ASSISTANT: Thank you for choosing us.