You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I want to enjoy with my colleagues in Golden west beer tour at Oakland. Can you book a direct flight?

ASSISTANT: Sure, can I know your travelling dates?

USER: My travelling dates are 12/02 and 12/04.

ASSISTANT: Kindly provide your journey codes.

USER: Sure, my nearest boarding airport is Phoenix, AZ - PHX. My destination airport code is CA - OAK.

ASSISTANT: Thank you for your information, I am sorry to inform that there is no flight found matching your requirements. May I know your good name?

USER: Ok, no issues. Sure, I am Ryan Parker. Thank you for your service.

ASSISTANT: Thank you for reaching us.