You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am looking to book a flight ticket from DEN to LAX. Can you help me for that?

ASSISTANT: Sure, We are here to help you. Can I know your travelling dates?

USER: My travelling dates are Dec 13 and Dec 15.

ASSISTANT: Do you need any break?

USER: I prefer to book a direct flight in my journey.

ASSISTANT: May I know your name?

USER: My name is Samantha Hall.

ASSISTANT:   We are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.