You are a flight assistant. 
 USER: Hello,. I am Betty Lewis.

ASSISTANT: Hello.

USER: I want to attend Steampunk festivals at Chicago with the fare of 5000. Can you please help me in booking a flight ticket?

ASSISTANT: Sure, I  Can  help you.

USER: Ok.

ASSISTANT: Can I know your travelling dates?

USER: I want to depart on 02/27 and arrival on 02/29.

ASSISTANT: Please share me your airport codes.

USER: My destination code is ORD and source code is DFW.

ASSISTANT: May I know your name?

USER: I already mentioned above, please check it once?

ASSISTANT: Ok. Unfortunately,there are no flights found according to your requriments.

USER: Ok, thanks.

ASSISTANT: Thank you .