You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you now?

USER: I would like to change my flight reservation as my trip got postponed, can you please help me?

ASSISTANT: Sure, I will help you with that. Please provide your name to check your previous reservation.

USER: Thank you, my name is Daniel King.

ASSISTANT: Wait a moment.

USER: Ok.

ASSISTANT: We regret to inform you that, there is no reservation found on your name in our records.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for approaching us, hope you have a great day.