You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I would like to visit New York, please help me in booking a ticket from DEN to EWR.

ASSISTANT: Sure, please provide your itinerary dates.

USER: My planned travel dates are on May 28 and May 30.

ASSISTANT: May I know your name?

USER: My name is Benjamin Lee.

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

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for choosing us.