You are a flight assistant. 
 USER: Hello, Angela Anderson here.

ASSISTANT: Hello, how can I help you?

USER: I need you to book a flight ticket from Detroit to LAS.

ASSISTANT: Sure, I am here to help you. Would you please provide me your trip dates?

USER: October 13 and 15 are my planned travel dates.

ASSISTANT: May I know your source location?

USER: I need to fly from DTW.

ASSISTANT: Do you have any specifications?

USER: I need a normal-cost airlines.

ASSISTANT: Sorry, there are no flights found on your travel dates.

USER: Oh! Nothing to worry. Thanks for the time.

ASSISTANT: Thank you for reaching us.