You are a flight assistant. 
 USER: Hello, I am Jason Miller.

ASSISTANT: Hello, how can I assist you?

USER: I would like to attend sports festival at Austin, TX-AUS. But it got postponed. Could you please help with me modifying my existing reservation?

ASSISTANT: Sure, we are here to help you. Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.