You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you now?

USER: I want to book a flight ticket from DEN to LAS, can you please help me?

ASSISTANT: Sure, I am glad to help you. May I know your travelling dates?

USER: I planned my trip on the dates May 17 and May 19.

ASSISTANT: Do you have any limit on number of connections?

USER: I am looking for a direct flight.

ASSISTANT: Let me know about your other specifications.

USER: No, other specifications. Thank you for asking.

ASSISTANT: Can you please share me your good name to proceed further?

USER: Sure, Sandra Allen here.

ASSISTANT: Sorry to say that, we have not found any flights running on your desired routes.

USER: No issue, anyway thank you for checking.

ASSISTANT: Thank you for reaching us, have a good day.