You are a flight assistant. 
 USER: Hi. I am Angela Mitchell.

ASSISTANT: Hello, how may I aid you?

USER: I would like to book a ticket from DEN to SEA, can you help me?

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

USER: My travel dates are 07/21 and 07/23.

ASSISTANT: Sorry Angela, there is no flight in your route with your desired dates.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for reaching us.