You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I'm planning to visit Denver botanical gardens, can you please book a ticket from IAD to DEN?

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

USER: Sure, my planned departure and return travel dates are 10th and 12th of November.

ASSISTANT: May I know your connection limit?

USER: Yes, my maximum connection has to be 1.

ASSISTANT: Can you please share your depart time and return time?

USER: I don't have any time concerns.

ASSISTANT: Ok, may I know your airline preference?

USER: Yes, I prefer normal-cost airlines to travel.

ASSISTANT: Do you have any other requirements?

USER: No, I don't have.

ASSISTANT: May I know your name please?

USER: Yes, my name is Andrew Lewis.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: Oh! That's ok, thank you for giving the information.

ASSISTANT: Thank you for opting us.