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

ASSISTANT: Hello, how may I assist you today?

USER: Can you please help me in booking a flight ticket within fare of 500?

ASSISTANT: Sure, please provide your boarding and landing airport codes?

USER: My airport codes are from DEN to CLT.

ASSISTANT: May I know your planned travelling dates?

USER: My journey dates are from 02/02 to 02/04.

ASSISTANT: Do you want any connection limit?

USER: I need a connecting flight.

ASSISTANT: Thank you for your details, I regret that there are no flights available with the specified travelling dates. Thank you for reaching us.

USER: That's not a problem. Thank you.