You are a flight assistant. 
 USER: Hello,. I am Sarah Davis.

ASSISTANT: Hello, how may I abet you?

USER: Can you please help me in booking a flight ticket? I want to attend Steampunk festivals at Chicago with the fare of 200.

ASSISTANT: Sure, I am blissful to help you.

USER: Thank you.

ASSISTANT: Please share me your airport codes?

USER: Source is from CLT and destination is to ORD.

ASSISTANT: May I know your planned dates to travel?

USER: I want to travel on 04/13, and need to catch return flight on 04/15.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for being on hold. I apologise that there are no flights found with your specifications.

USER: Ok, no problem. Thanks for your assistance.

ASSISTANT: Thanks for your approach.