You are a flight assistant. 
 USER: Hi. I am Benjamin Allen.

ASSISTANT: Hello, how can I assist you today?

USER: I want to book a normal-cost airline. Can you help me?

ASSISTANT: Sure, may I know your source and destination airport codes?

USER: CLT and ATL are my airport codes.

ASSISTANT: Can you please share your planned travel dates?

USER: 08/27 and 08/29 are my travelling dates.

ASSISTANT: Do you have any requirements?

USER: I need a economy class.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: No issue. Thank you.

ASSISTANT: Thank you for opting us.