You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I amend you today?

USER: I am Gregory Rodriguez. I want to attend for story festival at Oakland, OAK. Can you please book a ticket for me?

ASSISTANT: Sure, please share your source point.

USER: Source code is Houston, HOU.

ASSISTANT: Ok, on what dates you would like to travel?

USER: Travelling dates are 12/21 to 12/23.

ASSISTANT: Ok, do you need any halt?

USER: I need connecting flight.

ASSISTANT: Unfortunately, there were no flights found on your specified details.

USER: No problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you.

ASSISTANT: Have a nice day.