You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Ryan Taylor here. I have to give a seminar in Boston university, I need a flight ticket to travel. Can you please look for a flight in economy class?

ASSISTANT: Sure, may I know your travelling dates?

USER: Sure, my planned journey dates are Aug, 26-28.

ASSISTANT: Can I know your airport codes?

USER: Sure, my airport codes are from ORD to BOS.

ASSISTANT: Ok, please wait a minute.

USER: Sure and please make it fast that I have an important work to do.

ASSISTANT: Sorry, we could not find any flights available on your journey dates.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.

USER: Welcome.