You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I render you at this moment?

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 for checking purpose?

USER: My name is Mary Adams.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry Mary Adams, no reservation found on your name in our reservation list.

USER: Thanks.

ASSISTANT: Thank you for approaching us, have a nice day.