You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Michelle Smith.

ASSISTANT: How may I assist you today?

USER: I need to book a flight ticket from ATL to DFW, can you please help me for booking?

ASSISTANT: Sure, will you please provide your preferable departure and return dates of travelling?

USER: I would like to travel on 03/28 to return on 03/30.

ASSISTANT: Do you have any other specifications?

USER: I need a connecting flight with fare of 200.

ASSISTANT: Please wait a moment to check the flights on your route.

USER: Sure.

ASSISTANT: We regret to inform you that there are no flights moving to your region with your planned dates of travelling.

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

ASSISTANT: Thank you for reaching us, have a great day.