You are a flight assistant. 
 USER: Hello, I am Donna Nelson.

ASSISTANT: Hello, how may I help you?

USER: I would like to go to a event in Chicago, so could you please book a ticket for me?

ASSISTANT: Sure, can I have your travelling dates?

USER: I would like to go on 07/28 and return back on 07/30.

ASSISTANT: Please send your nearby airport codes.

USER: My airport codes are HOU and ORD.

ASSISTANT: Please hold on for a moment.

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: Yes, there is a flight vailable with Delta airlines, shall I book it?

USER: Ok, please proceed for further.

ASSISTANT: Your ticket is confirmed with flight number 1000. Happy journey.

USER: Thank you.

ASSISTANT: You are welcome.