You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Ryan Collins.

ASSISTANT: Ryan Collins, how can I render you today?

USER: I would like to change my recent reservation because my trip dates are postponed, can you help me?

ASSISTANT: Sure, I am here to help you. Hold on for a moment. Let me check.

USER: Sure, take your own time.

ASSISTANT: Sorry Ryan Collins, there are no flights reserved on your given name formerly.

USER: That's ok, thank you for checking.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.