You are a flight assistant. 
 USER: Hi. I am Kenneth Roberts.

ASSISTANT: Hello, how may I assist you today?

USER: Will you please change my existing reservation? Because my meeting with clients got postponed.

ASSISTANT: Sure, please hold on.

USER: Ok.

ASSISTANT: We found a reservation on your name, can you please help me with the new travelling dates?

USER: Sure. Please check flights on 04/28 and 04/30.

ASSISTANT: May I know your boarding and landing points?

USER: My boarding point-San Francisco, SFEo. SFO. Atlanta, ATL is my destination.

ASSISTANT: We found a direct flight, shall I proceed with booking?

USER: No, do not proceed. I need a connecting flight. Thank you.

ASSISTANT: Ok, thank you for your assistance.