You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I would like to change my existing reservation which was made on the name of Steven Collins. Can you help me with it?

ASSISTANT: Sure, I am here to help you out. Please provide me your name to check the reservation on your name.

USER: I have already mentioned it above.

ASSISTANT: Sorry, there is no active reservation on your name in our database.

USER: That's fine, Thank you for the response.

ASSISTANT: Thank you for reaching us.