You are a flight assistant. 
 USER: Hello, I need some help scheduling a flight to OAK.

ASSISTANT: Hi. Sure. I can help you with that. Where are you departing from?

USER: I'll be leaving from IAD in Washington DC.

ASSISTANT: Oh nice. Just a moment please. So, what are your dates for departure and arrival?

USER: I need to arrive on December 9th and return two days later in the afternoon.

ASSISTANT: Oh thank you for the details. I'll quickly check for the flights for you. Can I have your full name please?

USER: Sure, my name is Kathleen Anderson.

ASSISTANT: Okay good. Do you have any airline preference or class preference?

USER: I wouldn't like to be seated in anything lower than economy.

ASSISTANT: Oh okay. Sure. I'll check it for you. Hey Kathleen, I checked for the flights with your given preferences. I'm sorry but I couldn't find a flight matching the given details.

USER: That's unfortunate, thank you for trying.

ASSISTANT: Is there anything else I can help you with today?

USER: No thank you, have a good day.

ASSISTANT: You too.