You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I need to change my existing reservation due to my exams got postponed, can you please help me out?

ASSISTANT: Sure, may I know your name?

USER: Myself Nicole Mitchell.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: That's ok, thank you for searching my details.

ASSISTANT: Thank you for reaching us.