You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Can you help me to book a ticket from DCA to MCO?

ASSISTANT: Ok, may I know your travelling dates?

USER: Ok, please book a ticket for the dates July 10 and July 12.

ASSISTANT: Do you need connecting flight?

USER: Please book a direct flight.

ASSISTANT: Do have any other preference?

USER: No.

ASSISTANT: May I know your name?

USER: Ok, please book a ticket in the name David Carter.

ASSISTANT: Sorry, no flights available on your route.

USER: That is ok, thank you for assisting me.

ASSISTANT: Thank you for reaching us.