You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am David Hall.

ASSISTANT: How can I assist you?

USER: I am planning to travel from OAK to IAD,help me in booking a flight?

ASSISTANT: Ok, may I know your travelling dates?

USER: My travelling dates are 03/27 to 03/29.

ASSISTANT:  Here is a connecting flight with fare 100 and 1003 as flight number in economy class. Shall I proceed with booking?

USER: proceed for booking.

ASSISTANT: Ok, your ticket is confirmed.

USER: Thank you.

ASSISTANT: Thank you for reaching us.