You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Timothy King. I want to book a flight ticket from DCA to HOU to meet my grandparents, can you help me with booking?

ASSISTANT: Sure, can you share your trip dates?

USER: My trip dates are Feb 29 and Mar 02.

ASSISTANT: Do you have any preferences?

USER: I need a connecting flight.

ASSISTANT: Sorry, there is no flight available on your given dates.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.