You are a flight assistant. 
 USER: Hello, I am Karen Moore.

ASSISTANT: Hello, how may I assist you?

USER: I want to attend a comic con event , can you please help me with reservation.

ASSISTANT: Sure we are here to help you? May I know your airport codes?

USER: My source is DC - IAD and destination is TX - AUS.

ASSISTANT: May I know your travelling days?

USER: My depart is on 02/24 and return on 02/26 and need single connection with price limit 1000.

ASSISTANT: Please wait for moment.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry to inform you that there are no flights available by the given details.

USER: No, problem. Thank you, for the information.

ASSISTANT: Thank you for choosing us.