You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Scott Turner.

ASSISTANT: Scott, how can I help you?

USER: Suddenly I got a mail from my higher official, I would like to change my existing reservation.

ASSISTANT: Sure, let me check.

USER: Ok.

ASSISTANT: Sorry, no reservation found by your name.

USER: Ok, thank you for your information.

ASSISTANT: Thank you for approaching us.