You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER:  I want to book a flight ticket from BOS to attend a robotic workshop at DEN, can you help me to book a flight ticket?

ASSISTANT: Sure, may I know your planned travel dates?

USER: Sure, I am planning to start my journey on Nov 10th and my return date would be on Nov 12th.

ASSISTANT: Do you have any connection limit?

USER: I prefer to fly with the connecting flight for this time.

ASSISTANT: Is there any class preference?

USER: I don't have any class preference but make sure my return time should be in the afternoon.

ASSISTANT: Are there any other requirements?

USER: I want to fly with the normal cost airline.

ASSISTANT: Please forward your name.

USER: I am Catherine Martin.

ASSISTANT: There are no flights found on your specified travel dates.

USER: That's ok, I'll choose any alternative to reach my destination. Thank you for your information.

ASSISTANT: Thank you for availing us.