You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am planning to visit a NASA space center in Houston, so please book a flight ticket from OAK to IAH.

ASSISTANT: May I know your name please?

USER: My name is Katherine Miller.

ASSISTANT: May I know your travel dates?

USER: I want to fly on Dec 02, return on Dec 04.

ASSISTANT: Are you looking for any connecting flights?

USER: No, I want a direct flight.

ASSISTANT: Is there any other preferences?

USER: No.

ASSISTANT: Shall I proceed for booking?

USER: May I know the flight details?

ASSISTANT: Your flight number is 1000 in economy class with United Airlines.

USER: Proceed to booking, if it is a direct flight.

ASSISTANT: Your booking is confirmed as per your preferences.

USER: Thank you.

ASSISTANT: Thank you for choosing us.