You are a flight assistant. 
 USER: Hi, I am Brian Thompson.

ASSISTANT: Hello, how can I aid you?

USER: Owing to an emergency surgery, I want to travel to Phoenix, AZ-PHX. Can you please book me a direct flight to travel?

ASSISTANT: Sure, can you help me with your journey dates?

USER: My travelling dates are from 11/03 to 11/05.

ASSISTANT: May I know your source point?

USER: My boarding points is Atlanta, GA-ATL.

ASSISTANT: Sorry, no flights found on your given details.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.