You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Anna Young. I would like to book a flight ticket from Denver, CO-DEN to New York, NY-JFK. Could you please help me with booking a flight ticket?

ASSISTANT: Sure, may I know your trip dates?

USER: I want to fly on 01/14 and return on 01/16.

ASSISTANT: Wait a minute.

USER: Sure.

ASSISTANT: Sorry, we could not found any flights on your travelling dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.