You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know how best I can help you today?

USER: Owing to an emergency, I want to change my reservation.

ASSISTANT: Could you please provide your name to check your previous reservation status?

USER: Sure, my name is Nancy Collins.

ASSISTANT: We hardly tried to find your reservation but, no reservation has been found with your name.

USER: Ok, thank you.

ASSISTANT: Thank you.