You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: Can you please hold me a flight ticket in the name of Brenda Phillips?

ASSISTANT: Sure, may I know your journey dates?

USER: My trip dates are 11/24 - 11/26.

ASSISTANT: Can I know your airport codes?

USER: I want to fly from Atlanta, GA - ATL to reach San Francisco, CA - SFO.

ASSISTANT: Sorry, there are no flights on your journey dates.

USER: It's ok, thank you.

ASSISTANT: Thank you for availing us.