You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you today?

USER: I am Helen Hall. Can you aid me in changing my recent reservation?

ASSISTANT: Sure Helen Hall, I am happy to help you with that.

USER: Thank you.

ASSISTANT: Please wait a moment to check your reservation status.

USER: Sure.

ASSISTANT: Sorry Helen Hall, no reservation has found under your name to change.

USER: Its ok, thank you.

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