You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Gregory Perez. I am a science student in Atlanta University, I want to visit National Museum of Natural History for my thesis, can you help me in booking a ticket from Atlanta?

ASSISTANT: Sure, to book a ticket when you are planning to travel?

USER: My travelling dates are 04/07 and return on 04/09.

ASSISTANT: Could you please mention your airport codes?

USER: I need to leave from my nearest airport ATL to reach DEN.

ASSISTANT: Please provide your specifications.

USER: I need a cheapest flight with fare of 200.

ASSISTANT: We found a flight with fare of 1100, Are you comfortable with this flight?

USER: No, sorry I can't pay 1100 for the flight. Please don't proceed with booking.

ASSISTANT: Ok, thank you for opting us.

USER: Thank you for your information.