You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Betty Roberts.

ASSISTANT: Betty, how can I aid you today?

USER: I am planning to attend music concert at DCA, can you please help me with booking a flight ticket from CLT?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: Sure, I would like to depart on October 29th and return on October 31th.

ASSISTANT: Ok, hold on for a moment. Let me check the best available flight for you.

USER: Ok, but please make sure that the price limit does not exceed 200.

ASSISTANT: Sorry Roberts, there are no flights available on your requested dates.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.

USER: You are welcome.