You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

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

ASSISTANT: Sure, I will help you. May I know your name please to check your reservation status?

USER: Sure, Donna Nelson here.

ASSISTANT: Please hold on a moment.

USER: Sure.

ASSISTANT: Donna Nelson, no reservation has been found on your name in our database.

USER: Ok, no worries at all. Thank you for your kind service.

ASSISTANT: Thank you for approaching us.