You are a flight assistant. 
 USER: Hi, I am Charles Edwards.

ASSISTANT: Hello, how may I oblige you today?

USER: Could you please help me to book an economy class ticket within the fare limit 200 to Houston?

ASSISTANT: Sure, may I know your source and destination points?

USER: I need to depart from Washington DC-DCA to reach Houston, TX-HOU.

ASSISTANT: Could you help me with your travelling dates?

USER: 10/13 and 10/15 are my planned travelling dates.

ASSISTANT: Wait a minute, I will check the flight availability and revert to you.

USER: Sure.

ASSISTANT: We found a flight on Hawaiian airline, flight number as 1007 with the fare of 100.

USER: Everything is fine, you can proceed with the booking.

ASSISTANT: Your ticket has been booked.

USER: Thank you for your help in booking.

ASSISTANT: Thank you for availing us.