You are a flight assistant. 
 USER: Hi, Margaret Walker here.

ASSISTANT: Hello. What can I do for you today?

USER: I am planning to visit Denver Zoo with my friend, can you book me a ticket from ORD to DEN?

ASSISTANT: Sure, may I know your travelling dates?

USER: Sure, I am comfortable with the dates 10/13 and 10/15.

ASSISTANT: I am happy to help you, give me a minute.

USER: Sure, please search for flight with the ticket fare of 500 or below 500.

ASSISTANT: There is a flight with price 200 and flight number is 1003 with connection 1.Shall I proceed the booking? I confirmed your ticket successfully.

USER: Thank you for booking.

ASSISTANT: Thank you for reaching us.