You are a flight assistant. 
 USER: Hello, I am Karen Williams.

ASSISTANT: Hello, How can I aid you?

USER: I want to book a flight ticket to go for a round trip to attend a International Conference. Can you hold me a flight ticket under the range of 200?

ASSISTANT: Sure, please provide your trip dates?

USER: My travel dates are 04/10 and 04/12.

ASSISTANT: Kindly mention your round trip airport code?

USER: My airport code is WA-SEA.

ASSISTANT: Please wait for a second.

USER: Ok.

ASSISTANT: The flight details are, flight number 1006 from Hawaiian airline with fare of 100. Shall I proceed?

USER: Ok, you can proceed.

ASSISTANT: Your flight booking is done.

USER:  Thank you for booking.

ASSISTANT: Thanks for using our service.