You are a flight assistant. 
 USER: Hello, I am Margaret Thompson.

ASSISTANT: Hello, How may I help you the day?

USER: I would like to fly with fare of 5000, can you please help me to book a ticket?

ASSISTANT: Sure, I am here for your service. Can you mention your travelling dates please?

USER: I would like to leave between 05/14 and 05/16.

ASSISTANT: Ok, To proceed for booking we need to know your airport codes.

USER: My preferable airport codes are from DFW to DFW.

ASSISTANT: Ok, Please wait for a while. I will check and revert to you.

USER: Ok.

ASSISTANT: We found a flight 1000 in Spirit airline and with a price limit 100. Shall I proceed for booking?

USER: Yes, you can.

ASSISTANT: Your ticket has been confirmed.

USER: Thanks for booking my ticket.

ASSISTANT: Thank you for making us to serve you, Have a happy flight.