You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Frank Martinez here. I want to attend my daughter's convocation ceremony, could you book my flight ticket from SEA to DEN?

ASSISTANT: Sure, I am here to help you out. Please provide me your trip dates.

USER: My itinerary dates are 10/05 and 10/07.

ASSISTANT: Sorry Frank Martinez, there is no flight to make reservation for you on your travel dates.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.