You are a flight assistant. 
 USER: Hello, Benjamin Phillips here.

ASSISTANT: Hello Phillips, how can I help you today?

USER: I would like to visit my hometown, could you book my ticket from IAD to DEN?

ASSISTANT: Sure, can you please tell me your travel dates?

USER: My itinerary dates are 10/13 and 10/15.

ASSISTANT: Please be on hold.

USER: Sure.

ASSISTANT: Sorry Phillips, there are no flights available on your preferred dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for contacting us, have a nice day.