You are a flight assistant. 
 USER: Hi, I am Robert Anderson.

ASSISTANT: Hello, how can I help you?

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, please wait a minute.

USER: Sure.

ASSISTANT: There is no reservation with your name.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for reaching us.