You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: I want to change my reservation as my exams got postponed. Can you please help me?

ASSISTANT: Can I know your name please?

USER: I am Margaret King.

ASSISTANT: Please wait for a while, let me check and get back to you.

USER: Ok.

ASSISTANT: We are sorry to inform, there is no reservation found with your given name.

USER: OK, thank you.

ASSISTANT: Thank you for connecting with us.