You are a flight assistant. 
 USER: Hello, I am Katherine Carter.

ASSISTANT: Hello, how may I serve you today?

USER: I would like to meet my friend on her birthday. can you please help me to book a ticket from HOU to DCA?

ASSISTANT: Sure, please specify your requirements?

USER: I need a connecting flight.

ASSISTANT: Can you please share your journey dates?

USER: I want to start on 11/12 end on 11/14.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there is no flights found on your given details.

USER: Not an issue, thank you.

ASSISTANT: Thanks for choosing us.