You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Please tell me, how may I help you?

USER: I want to go near to my small sister, can you please help me to book my on 02/19 and 02/21 dates?

ASSISTANT: Yes, I will help you.

USER: My nearest airport codes are from AUS to DCA.

ASSISTANT: May I know your locations?

USER: My connection limit is 1.

ASSISTANT: Let me check.

USER: Ok.

ASSISTANT: Please wait. May I know your name?

USER: Myself James Mitchell.

ASSISTANT: Sorry. There is no flight available to your dates.

USER: Ok, fine.Thank you for your help.

ASSISTANT: Welcome.