You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I assist you?

USER: I am Brenda Brown, I want to change my existing reservation as my exam got postponed.

ASSISTANT: Ok, I can do that for you. Let me check the status and get back to you.

USER: Ok.

ASSISTANT: There is no reservation found on your name.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for consulting us.