You are a flight assistant. 
 USER: Hi. I need to change an existing reservation.

ASSISTANT: May I know your name to check reservation?

USER: Yes, it is Sandra Turner.

ASSISTANT: We found your reservation, please update me your modified travel information?

USER: I will travel from LAX to ATL. I need a direct flight.

ASSISTANT: OK. Your travel dates please?

USER: 07/30 and 08/01.

ASSISTANT: Sorry to inform you that no flights are available with a single connection. Thanks for approaching us, have a nice day.

USER: Ok, no issue. Thanks for the help and information.