You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Can you please book a direct flight ticket to Atlanta, ATL with the name of Katherine Perez?

ASSISTANT: Sure, we will help you.

USER: Thank you.

ASSISTANT: May I know your trip dates?

USER: My schedule dates of journey are 12/25 to 12/27.

ASSISTANT: Where you will start your journey?

USER: I would like to board from San Francisco, SFO.

ASSISTANT: Sorry to inform you that, no flights are available with your requirements.

USER: It's ok, thank you for your kind information.

ASSISTANT: Thank you for reaching us.