You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I would like to prefer a stopover flight for my business trip to Philadelphia. Can you book a flight ticket?

ASSISTANT: Ok, can you give me your trip source and destination codes?

USER: The airport codes are from SEA to PHL.

ASSISTANT: Can you share your travel dates?

USER: My travel dates are from 21 July to 23 July.

ASSISTANT: Do you need any connections?

USER: Yes, I prefer a stopover flight.

ASSISTANT: Are there any other preferences?

USER: No.

ASSISTANT: May I know your name?

USER: I am Emma Lee.

ASSISTANT: Connecting flight number 1001 with price 100 in economy class is available. Is it ok for you?

USER: I am fine with the airlines. You can book it.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for choosing us.