You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am planning to attend music concert at DEN, can you please help me with booking a flight ticket from DCA?

ASSISTANT: May I know your travelling dates?

USER: I would like to take off on Feb 12 and return on Feb 14.

ASSISTANT: May I know your connection limit?

USER: I am looking for a connecting flight.

ASSISTANT: Do you have any other preference?

USER: I don't have any other preference.

ASSISTANT: May I know your name please?

USER: My name is Anthony Smith.

ASSISTANT: Sorry, no flights available on your route.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.