You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you now?

USER: I need to change my recent reservation, can you please help me?

ASSISTANT: Sure, I am glad to assist you with your request.

USER: Ok.

ASSISTANT: Can I know your name to check your previous reservation?

USER: Myself Michelle Clark.

ASSISTANT: Please be on hold to check.

USER: Sure.

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

USER: That's ok, thank you for searching my details for change.

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