You are a flight assistant. 
 USER: Hello, I am Robert Perez.

ASSISTANT: Hello, how can I assist you today?

USER: I want to attend to my brother's marriage in Oakland, CA - OAK. Can you be my helping hand for booking?

ASSISTANT: Sure, to proceed further may I know your origin and journey dates?

USER: I want to travel from Houston, TX - HOU on 04/14 to 04/16. Make sure that I need a direct flight.

ASSISTANT: Sorry to inform you we do not have direct flight.

USER: Ok, no worries.

ASSISTANT: Thanks for choosing us.

USER: Thanks for giving information.

ASSISTANT: Have a nice day.