You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you?

USER: I am Nicholas Wright, Could you help me to book a ticket from Denver, DEN to New York, JFK?

ASSISTANT: Sure, Please help me with your travel dates.

USER: I will depart on 09/05 and return on 09/07.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, not a problem. Thank you for quick response.

ASSISTANT: Thank you for opting us.