You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Virginia Walker here. I just to book my ticket to visit DEN from ORD, can you help with it?

ASSISTANT: Sure, May I know your travelling dates?

USER: Sure, my travelling dates are Apr 16th and Apr 18th.

ASSISTANT: Do you have any preferences?

USER: Yes, I must have only single connection. I can afford only 5000 and below.

ASSISTANT: You have a flight 1004 in Southwest airline and price 100 with a connection, Shall I proceed?

USER: Yes, please proceed.

ASSISTANT: Your ticket has been reserved.

USER: Thanks for your service.

ASSISTANT: Thank you.