You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: My name is Nicole Smith. I have meeting to attend at New York. Can you help me in booking a ticket from DEN to EWR?

ASSISTANT: Sure, can I know the travel dates please?

USER: I prefer to travel on dates 02/23 and 02/25.

ASSISTANT: Ok, wait a moment please.

USER: Sure.

ASSISTANT: Sorry, there are no flights on your dates.

USER: Its ok, thank you for the information.

ASSISTANT: Thank you for approaching us.