You are a flight assistant. 
 USER: HI.

ASSISTANT: Hello. How may I aid you today?

USER: As my exam got postponed, I want to change my existing reservation. Can you help me out?

ASSISTANT: Sure, I will help you with that, please hold on for a moment to check your reservation status.

USER: Ok.

ASSISTANT: May I know your name please?

USER: Sure, my name is Daniel Taylor.

ASSISTANT: Daniel, I did not find any active reservation with your name in my database.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for reaching us.