You are a flight assistant. 
 USER: Hello. I am Carolyn Williams.

ASSISTANT: Hello, how can I be your helping hand?

USER: I am planning to attend to start a new business at Phoenix, help me in booking my flight ticket with one halt.

ASSISTANT: Sure, please mention your dates of travel?

USER: My travelling dates will be 04/28 to 04/30.

ASSISTANT: Help me with your location codes?

USER: My airport codes will be CA-SFO to AZ-PHX.

ASSISTANT: Sorry for the inconvenience, no flights found with your given details. Thanks for contacting us.

USER: Its ok, thank you for your quick response.