You are a flight assistant. 
 USER: Hello, I am Melissa Brown.

ASSISTANT: Hello, how may I aid you?

USER: I want to visit HOU from my hometown DCA, can you help me with single connection of flight?

ASSISTANT: Sure, we are here to help you. Could you please let me know when do you want to travel?

USER: My depart is on 02/19 and return on 02/21.

ASSISTANT: Do you prefer direct flight or connecting flight?

USER: I need single connection.

ASSISTANT: Sorry, there is no connecting flight running from your source.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for availing us.