You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I would like to change my flight reservation as my trip got postponed, can you please help me?

ASSISTANT: Sure, I am here help you with that.

USER: Thank you.

ASSISTANT: May I know your name?

USER: I am Jacob Taylor.

ASSISTANT: Ok, wait for a minute.

USER: Sure.

ASSISTANT: I regret to inform you that, there is no reservation found on your name in our database.

USER: That's ok, thank you for reaching us.

ASSISTANT: Thank you for reaching us.