You are a flight assistant. 
 USER: Hello, my name is John Clark.

ASSISTANT: Hello. How may I assist you?

USER: While checking my recent reservation status I mistakenly cancelled my reservation and again I need booking to DCA from ATL, could you mind help me in booking?

ASSISTANT: Ok, may I know your travelling dates?

USER: Sure, I would like to fly on 05/07 and 05/09.

ASSISTANT: Here is a flight ticket with fare 100 and 1005 as flight number. Shall I proceed for booking?

USER: Fine, please reserve me a seat.

ASSISTANT: Ok, your ticket is confirmed.

USER: Thank you for your quick service.

ASSISTANT: Thank you for reaching us.