You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Elizabeth Moore.

ASSISTANT: How can I help you?

USER: Can you please help me out in booking the ticket from JFK to DCA? As I'm planning to attend a seminar in my university.

ASSISTANT: Sure, I will help you to book a flight. Can you please share me your travelling dates?

USER: My preferable journey dates are 04/23 and 04/25.

ASSISTANT: Please give me a moment.

USER: Ok, take you time.

ASSISTANT: Sorry, no flights are available on your route.

USER: That's ok, thank you for checking.

ASSISTANT: Welcome, have a nice day.