You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what services are you seeking from us?

USER: Can you please help me to book a flight from HOU to IAD?

ASSISTANT: Sure, please share me your trip dates.

USER: I want to depart on Apr 19 and need to return on Apr 21.

ASSISTANT: Which flight you have preferred to travel either a connecting flight or a direct flight?

USER: I am comfortable with any flight.

ASSISTANT:  If you can help me with your name, I can begin looking up for the availability of flights.

USER: Lisa Nelson here.

ASSISTANT: Are there any other specifications?

USER: No.

ASSISTANT: Thank you for waiting and we have found a flight in an economy class with 1 connection in Spirit airlines and the fare of your flight will be 100. Do you like me to proceed your booking with this flight?

USER: Ok, please proceed.

ASSISTANT: Your booking is done with flight number 1000.

USER: Thank you.

ASSISTANT: Thank you for opting us.