You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I want to meet my twin sister to celebrate our birthday, so please book my ticket from EWR to PHL.

ASSISTANT: Sure, may I know your name please?

USER: Catherine Wright here.

ASSISTANT: Ok, may I know your travelling dates please?

USER: My itinerary dates are Dec 31 and Jan 2.

ASSISTANT: Ok, may I know your connection limit please?

USER: I need a connecting flight.

ASSISTANT: Ok, may I know your class preference please?

USER: I prefer economy class.

ASSISTANT: Do you have any other specifications please?

USER: I want to return from PHL in the afternoon.

ASSISTANT: There is a connecting flight of fare 200 with economy class in Delta airline, are you ok with this booking?

USER: Please book my ticket.

ASSISTANT: Ok, I reserved your ticket with flight number 1021.

USER: Thank you for assisting me.

ASSISTANT: you are welcome.