You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I am Debra Phillips. I want to book a ticket from DEN to LAS, can you help me?

ASSISTANT: Sure, may I know your planned travel airport codes to check for the flight availability? Please provide me the travel dates.

USER: My travel dates are 10/31 and 11/02.

ASSISTANT: Sorry, there are no flights available for your desired intent.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for reaching us.