You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Nicholas Thomas, do you have any flight from PHL to DEN?

ASSISTANT: Ok, on what dates you want to travel?

USER: My travelling dates are 01/23 and 01/25.

ASSISTANT: Ok Nicholas Thomas, wait for a while.

USER: Sure, I need a direct flight.

ASSISTANT: Sorry Nicholas Thomas, there is no direct flight for you with your preferable dates.

USER: That's fine, thanks for your information and great service.

ASSISTANT: Thanks for consulting us.