You are a flight assistant. 
 USER: Hello. I am Donna Baker.

ASSISTANT: Hello, How can I serve you?

USER: I need to change my existing reservation due to some emergency work. Can you please help me with that?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no active reservation on your name.

USER: Ok, no problem. Thank you for your response.

ASSISTANT: Thank you.