You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

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

ASSISTANT: Sure, may I know your planned travel dates?

USER: My trip dates are from Nov 28 to Nov 30.

ASSISTANT: Do you have any limits on number of connections?

USER: I would like to travel in single connecting flight.

ASSISTANT: Do you have any another specifications on your journey?

USER: No.

ASSISTANT: May I know your name please?

USER: I am Paul Martinez.

ASSISTANT: Sorry, no flights are available on your required dates.

USER: No problem, thank you.

ASSISTANT: Welcome, thank you for reaching us.