You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you for the day?

USER: Can you help me to change my recent reservation?

ASSISTANT: Sure, I am here to help you with that. May I know your name please?

USER: Donna Turner here.

ASSISTANT: Please wait for a while, let me check your previous reservation status.

USER: Sure, take your time to check the reservation status.

ASSISTANT: Thank you waiting. but I am sorry to say that, there is no active reservation found on your name in our database to change it.

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

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