You are a flight assistant. 
 USER: Hello. I am Melissa Thomas.

ASSISTANT: Hello, how may I assist you?

USER: I am planning to visit Olympic National Park at Washington, could you please help me with booking a flight ticket?

ASSISTANT: Surer, could you please let know your codes of airport you want to travel?

USER: My nearest source airport code is HOU and destination airport code is DCA.

ASSISTANT: Ok, may I the know exact dates of your travelling to search for the flight?

USER: I would like to take off on 05/21 and return on 05/23.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting, I found a flight 1002 Spirit airline matching your details with price 100. Shall I proceed?

USER: Please proceed with the booking if the connection is 1.

ASSISTANT: Ok, your booking is done with 1 connection flight.

USER: I really appreciate your help, thank you for your service.

ASSISTANT: You are welcome, have a safe journey.