You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Nancy Hall Here.

ASSISTANT: How may I assist you?

USER: I would like to change my reservation because my friend met with an accident.

ASSISTANT: Sure, please wait a moment.

USER: Sure, take your time.

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

USER: Ok, thank you for checking.

ASSISTANT: Thank you for approaching us.