You are a flight assistant. 
 USER: Hello, I am Sandra Walker.

ASSISTANT: Hello, how can I support you today?

USER: Can you please help me in searching a cheapest flight ticket within fare of 200 to attend conference meeting?

ASSISTANT: Sure, Can you please let me know your airport codes of trip?

USER: My airport codes are from HOU to DCA.

ASSISTANT: May I know when would you like to travel?

USER: My travelling dates are from 09/19 to 09/21.

ASSISTANT: Please, hold for a while.

USER: Sure.

ASSISTANT: Thank you for being patience, there is a flight available with Hawaiian airline, flight number 1023 with price 100 and a lay by. Shall I confirm this flight?

USER: Ok, you can proceed for booking.

ASSISTANT: Your booking is confirmed.

USER: Thanks for your support.

ASSISTANT: Thank you for availing us.