You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I best serve you now?

USER: My name is Justin Johnson.

ASSISTANT: Thanks for providing your name.

USER: Can you please help me with booking a flight ticket to Chicago as I need to attend my colleague's ring ceremony on 07/29?

ASSISTANT: Sure, may I know your source and destination airport codes?

USER: Sure, I will start from IAD and reach ORD.

ASSISTANT: Can you please share me your return date?

USER: My return date will be 07/31.

ASSISTANT: Do you need any other specifications?

USER: I need a connecting flight. My price limit is 500.

ASSISTANT: There is a flight found with Southwest airline of flight number 1000 and fare is 100.

USER: Please proceed.

ASSISTANT: Your ticket has been reserved.

USER: Thank you for your help.

ASSISTANT: Thanks for approaching us.