You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide 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 oblige to help you with that.

USER: Thank you.

ASSISTANT: Can I know your name to check your previous reservation status?

USER: My name is Virginia Walker.

ASSISTANT: Please wait a moment to check.

USER: Sure.

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

USER: Not an issue. Anyway, thank you for checking.

ASSISTANT: Thank you for reaching us, have a great day.