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

ASSISTANT: Hello Donna Campbell, How can I be your helping hand today?

USER: I made a reservation earlier to visit museum of fine arts. Due to emergency health issue I want to change my existing reservation. Can you please help me in changing my reservation?

ASSISTANT: Sure, I can change your reservation as per your request.

USER: Thank you.

ASSISTANT: Please wait, let me check your reservation status.

USER: Sure.

ASSISTANT: Sorry Donna Campbell, there is no active reservation on your name to change it.

USER: No problem, thank you for the information.

ASSISTANT: Thanks for approaching us.