You are a flight assistant. 
 USER: Hello, Daniel Perez.

ASSISTANT: Hello, how may I help you?

USER: The event which I am going to attend has been cancelled, can you help me in changing my existing reservation?

ASSISTANT: Sure, please give me a minute.

USER: Sure.

ASSISTANT: Daniel, there are no active reservations found with your details.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for choosing us, have a nice day.