You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Janet Allen.

ASSISTANT: How can I aid you?

USER: I am planning to visit a orphan home at Denver, help me in booking my flight ticket  from Las Vegas NV-LAS to CO-DEN.

ASSISTANT:  we are rapturous to help you. Can I know your travelling dates?

USER: My departure date is 11/16, I am planning to return on 11/18.

ASSISTANT: Do you need any break?

USER: Yes, I need a break in between the journey.

ASSISTANT: OK. Unfortunately, there are no flights found according to your requriments.

USER: Its ok, thank you for your assistance.

ASSISTANT: Thank you for consulting us.