You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I serve you for the day?

USER: Owing for an emergency, I want to change my reservation. Can you please help me out?

ASSISTANT: Ok, please provide me your name of booking.

USER: Sure, my name is Amy Johnson.

ASSISTANT: Let me check with your previous reservation.

USER: Sure.

ASSISTANT: Amy Johnson sorry to inform you, there are no flight reservation by your name.

USER: Not an issue, thank you for checking.

ASSISTANT: Thank you for choosing our services.