You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I serve you today?

USER: I am Carolyn Green. I want to change my existing reservation due to board exams. Can you help me in this?

ASSISTANT: Sure, I am glad to help you.

USER: Ok.

ASSISTANT: Please be on hold.

USER: Sure.

ASSISTANT: There is no reservation found on your name in our database.

USER: That's ok, thank you.

ASSISTANT: Thank you for availing us.