You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am Jacob Garcia planning to visit Phoenix, can you help me to book a direct flight?

ASSISTANT: May I know your travel dates please?

USER: Sure, my travelling dates will be 11/26 and 11/28.

ASSISTANT: Please mention your airport codes for further process.

USER: Yes, I want to fly from OAK to PHX.

ASSISTANT: Please give me a minute.

USER: Ok.

ASSISTANT: Sorry Jacob, there is no direct flight available on your route.

USER: That's ok, thank you.

ASSISTANT: Thank you for approaching us.