You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I want to attend a birthday party with my friends at Chicago, can you please help me to book a ticket?

ASSISTANT: That's great, may I know your arrival and departure dates?

USER: Sure, my arrival date is 08/28 and my departure date is 08/25.

ASSISTANT: What are your travel location airport codes for further booking?

USER: My airports codes are from ATL to ORD.

ASSISTANT: May I know your name for documentation purpose?

USER: Sure, my name is Janet Scott here. Please make sure that price should not exceed of cost 500.

ASSISTANT: Sad to inform you, there is no flight availability on your provided dates on the route from ATL to ORD.

USER: Ok, no problem.

ASSISTANT: Janet Scott, thank you for reaching us.

USER: Ok, thank you.

ASSISTANT: Have a good day, welcome.