You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Alexander Gonzalez here. I would like you to book a ticket for me to Chicago on the occasion of my sister's convocation ceremony.

ASSISTANT: Sure, can you please share your airport locations?

USER: My genesis and terminus airport codes DCA and ORD.

ASSISTANT: May I know when you are willing to travel?

USER: My itinerary dates are Jan 06 and Jan 08.

ASSISTANT: Do you have any specifications to be met?

USER: I would like to go with a single connection and price limit of 500.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for your time, unfortunately no flights available on that route.

USER: No issue, I will make another arrangement.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your service.