You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you today?

USER: Owing to an emergency I had to request for this change reservation.

ASSISTANT: Sure, I am here to help you. May I know your name?

USER: My name is Barbara Edwards.

ASSISTANT: There is no reservation found with your name.

USER: Thanks.

ASSISTANT: Thank you for choosing us.