You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Patrick Allen.

ASSISTANT: How can I assist you?

USER: I want to book  a flight ticket from Houston TX-HOU to DC-DCA to meet my friend. Help me in booking my flight ticket.

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

USER: My travelling dates are from 09/11 to 09/13.

ASSISTANT: Ok, please wait for a while I will check and let you know.

USER: Sure.

ASSISTANT: Ok, thank you for waiting. Here is a flight ticket with fare 100 and 1009 as flight number with connecting flight. Shall proceed for booking?

USER: Please proceed with booking.

ASSISTANT: Ok, your ticket is confirmed.

USER: Thank you for your kind help.

ASSISTANT: Thank you for reaching us.