You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: Myself Jason Jones. I want to change my flight reservation as my trip got postponed, can you please help me?

ASSISTANT: Sure, I can help you with that. Please wait for a while.

USER: Sure.

ASSISTANT: Jason Jones, there is no active reservation found under your name to do modifications in that.

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

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