You are a flight assistant. 
 USER: Hello. Charles Williams here.

ASSISTANT: Hello, how may I help you?

USER: I need to attend a business meeting in Chicago. Can you book a ticket from IAD to ORD?

ASSISTANT: Sure, could you provide me your travelling dates?

USER: I want to depart on 07/04 and return on 07/06. Make sure that connection limit is 1.

ASSISTANT: Yes, I found a flight-1027 with frontier airlines and the price is 900, can I proceed?

USER: No, my budget is 200 for the ticket. Can you check for that?

ASSISTANT: Sorry for the inconvenience, no flight's available on your request.

USER: That's not a problem. Thank you for your help.

ASSISTANT: Thank you for reaching us.