You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Rebecca Baker here. I need to travel from New York for an urgent meeting conducted by my company. So can you please help me for book a flight ticket with connections 0?

ASSISTANT: Sure Baker, I will help you out in booking the ticket. May I know your travelling dates?

USER: My departure date is 04/11 and return date is 04/13.

ASSISTANT: Can I know your travelling airport codes?

USER: My airport codes are from NY-JFK to CO-DEN.

ASSISTANT: OK, please wait a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, there are no flights found on these dates.

USER: So sad for that. Anyway, thank you for the information.

ASSISTANT: Thank you for choosing our services.