You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you help me to book a flight ticket from HOU to IAD?

ASSISTANT: Your travelling dates please?

USER: My travelling dates are 25 to 27 of June.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Is there any specifications?

USER: No.

ASSISTANT: May I know your name please?

USER: I am Samantha Jones.

ASSISTANT: I am sorry no flights found on your route.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for choosing us.