You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Brenda Young.

ASSISTANT: How can I serve you?

USER: Could you please help me to book a flight ticket with single connection from Seattle to visit Olympic National Park in Boston?

ASSISTANT: Sure. Could you please share your exact airport codes?

USER: My boarding and landing airport codes are SEA and BOS.

ASSISTANT: When are you willing to make your trip?

USER: I intend to depart on Nov 22nd and my return date will be on Nov 24th.

ASSISTANT: We found a UA airline, flight number:1021 and the price is 200.

USER: That's perfect, you can book the ticket with this airline.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you for your assistance in booking.

ASSISTANT: Thank  you for choosing us.