You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I support you today?

USER: Owing for an emergency, I would like to change my flight reservation. Can you please help me?

ASSISTANT: Sure, I can change your reservation right now. Before that I need to know your good name please?

USER: Thank you. I am Anthony Evans.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

USER: Not an issue. Anyway, thank you for checking.

ASSISTANT: Thank you for choosing us.