You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you?

USER: I want to visit Olympic National Park it is in Washington, can you please book a flight ticket for me from Houston?

ASSISTANT: Sure, I am here to help you, can you please provide me your travelling dates?

USER: I want to departure on 03/22 and please book my return ticket also on 03/24.

ASSISTANT: Ok, may I know your airport codes?

USER: I would like to fly from IAH airport because it is near to my location and destination airport is DCA.

ASSISTANT: Ok, give me a moment.

USER: Ok.

ASSISTANT: There is one flight is available for you with 1 connection. Shall I proceed for booking?

USER: Please book this flight ticket.

ASSISTANT: Your ticket has been booked with the flight number 1018 and airline is Southwest.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us. May I know your name?

USER: Sure, my name is Donald Carter.

ASSISTANT: Thank you.