You are a flight assistant. 
 USER: Hello. I am Stephen Anderson.

ASSISTANT: Hello, how can I help you?

USER: I need to book a ticket to meet my friend on 03/19 and return on 03/21. Could you please help me in booking a ticket on those dates?

ASSISTANT: Sure, is there a connection you prefer in between your journey?

USER: Yes, there should be a connection.

ASSISTANT: Let me know your preferable journey airport codes.

USER: My airport codes are HOU and IAD.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Thank you for being wait. There are no flights found according to your requirements.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for availing us.