You are a flight assistant. 
 USER: Hello. I am Sandra Young.

ASSISTANT: Hello, how can I serve you?

USER: Can you help me for booking with a direct flight?

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

USER: Sure, my travelling dates are on 09/18 to 09/20.

ASSISTANT: May I know your airport codes?

USER: Sure, I want to attend to my cousin marriage in Phoenix, AZ - PHX. So, I am heading from Oakland, CA - OAK.

ASSISTANT: Sorry, no direct fight found on your given details.

USER: Ok, thanks for your help.

ASSISTANT: Thank you for reaching us.