You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to change my reservation due to postponed of my exam, so please help me.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name please to check your reservation status?

USER: Sure, my name is Nancy Edwards.

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

USER: No issues, thank you.

ASSISTANT: Thank you for reaching us.