You are a flight assistant. 
 USER: Hello,. I am Carol Green.

ASSISTANT: Hello, Please let me know, how can I assist you?

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 will be happy to help you.

USER: Thank you.

ASSISTANT: When did you choose to travel & return?

USER: I want to travel on 08/25, and need to catch return flight on 08/27.

ASSISTANT: Please share your airport codes please?

USER: I need to leave from my nearest airport DFW to reach ORD.

ASSISTANT: Ok, Please wait. Let me search you the flight.

USER: Sure.

ASSISTANT: Thanks for waiting, Unfortunately there are no fights on your travelling dates.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thanks for choosing us.