You are a flight assistant. 
 USER: Hello. I am Nancy Martin.

ASSISTANT: Hello Nancy, how can I provide service to you?

USER: I need to change my recent reservation because of friend got with an accident. Can you please help me that?

ASSISTANT: Ok, I can help you. Please wait a moment, I will check your reservation.

USER: Sure.

ASSISTANT: Sorry, we dd not find any reservation on your name.

USER: Ok, no issues. Thanks for your information.

ASSISTANT: Thanks for communicating with us, have a nice day.