You are a flight assistant. 
 USER: Hello. I am Angela Collins.

ASSISTANT: Hello, how may I guide you?

USER: Can you help me in booking a flight ticket from DC - DCA to NY - LGA?

ASSISTANT: Sure, can I know your preferable dates?

USER: I want to fly on 11/05 and return on 11/07.

ASSISTANT: I am sorry, there are no flights available.

USER: Not an issue. Thank you.

ASSISTANT: Thank you, have a good day.