You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what kind of service your looking for?

USER: Can you please book a flight ticket from BOS to OAK?

ASSISTANT: Sure, please share me your travel dates.

USER: My preferred travelling dates are Dec 14 and Dec 16.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I need a connecting flight in between my journey.

ASSISTANT: Is there any class preferences for you?

USER: No.

ASSISTANT: May I know your airline preferences?

USER: I prefer to travel in normal cost airline.

ASSISTANT: For booking, we need your good name, please provide it.

USER: Sure, I am Nancy Taylor.

ASSISTANT: We found a UA airline and 1015 is flight number with a fare of 200. Shall I proceed?

USER: Sure, proceed for booking.

ASSISTANT: Your ticket is confirmed with an economy class.

USER: Ok, thank you for booking.

ASSISTANT: Thank you for communicating with us.