You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: I want to participate in Boston marathon, could you book my ticket from DEN to BOS?

ASSISTANT: Sure, can you share your trip dates?

USER: My itinerary dates are Aug 7 and 9.

ASSISTANT: Do you have any connection limit?

USER: I need 1 lay by in my journey.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: Are there any other specifications?

USER: I prefer to travel in normal-cost airlines.

ASSISTANT: Please forward your name.

USER: Patrick Phillips here.

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

USER: No problem, thank you.

ASSISTANT: Thank you for availing us.