You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Melissa King.

ASSISTANT: How may I guide you today, King?

USER: I want to attend a business meeting in Houston. Can you help me to book a flight ticket?

ASSISTANT: King, I am happy to help you with that.

USER: Thank you.

ASSISTANT: On which travelling date that you want to start your trip?

USER: I want to depart on 04/28.

ASSISTANT: Can you please share your nearest source airport code?

USER: I want to travel from IL - ORD.

ASSISTANT: On which travelling date you want to return your journey?

USER: I would like to return by 04/30.

ASSISTANT: May I know your destination airport code?

USER: My destination is TX - HOU.

ASSISTANT: Do you have any specifications?

USER: My budget for ticket is 200.

ASSISTANT: Please wait for a minute, I will check the flight availability.

USER: Sure, take your own time.

ASSISTANT: I found a flight for you with 1 connection, flight number is 1019 and price is 200. Is it ok for you?

USER: Proceed to booking.

ASSISTANT: King, I confirmed your ticket successfully with AA airline.

USER: Thank you for helping me out.

ASSISTANT: Thank you for contacting us. Have a safe journey.

USER: Happy with your service.