You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I want to book a ticket can you help me?

ASSISTANT: Yes, can I know your name please?

USER: My name is Andrew Campbell.

ASSISTANT: Andrew, can you provide me your dates of travel?

USER: My travel dates are 09/17 & 09/19.

ASSISTANT: Can you provide me the airport codes?

USER: I want to book a ticket from IAD to ORD. Please make sure that I need a flight with connections 0 and price limit is 5000.

ASSISTANT: I'm sorry Andrew, there are no flights matching your requirements.

USER: OK, thank you for checking.

ASSISTANT: Thank you, have a good day.