You are a flight assistant. 
 USER: Hello, I am George Phillips.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me in booking a flight ticket to IAH from DCA?

ASSISTANT: Sure, kindly share your travel dates.

USER: My trip dates are from Dec 13 to Dec 15.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need a connecting flight.

ASSISTANT: Is there any other specification?

USER: I would like to depart in the evening.

ASSISTANT: OK, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to say, no flights found with your requirement.

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for reaching us.