You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How can I help you?

USER: There is a Zoo in Denver which is very famous, And I am taking my kids there for a holiday. Will you help me in booking a flight ticket?

ASSISTANT: Sure, can I have your travelling dates?

USER: I would like to travel on 02/21 and return on 02/23.

ASSISTANT: How much you can afford for a flight ticket?

USER: I can afford upto 500 for a ticket.

ASSISTANT: May I know your name please?

USER: My name is Edward Davis.

ASSISTANT: Please mention your depart and arrival airport codes?

USER: PA-PHL and CO-DEN are my depart and arrival airport codes.

ASSISTANT: Please wait, I will let you know the flight details.

USER: Sure.

ASSISTANT: Thanks for your time, there is a flight from an UA airline of fare 100 and flight number 1000 with one connection. Shall I proceed to book?

USER: Proceed with the booking.

ASSISTANT: Your flight ticket is processed.

USER: Thank you for your kind help.

ASSISTANT: Thanks for communicating with us.