You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Will you please book me a flight ticket from DFW to LAS?

ASSISTANT: Please provide your journey dates.

USER: I am planning to start on July 20th and return on July 22nd.

ASSISTANT: Do you prefer connecting flight?

USER: Yes, I need 1 lay by.

ASSISTANT: Is there any other requirement?

USER: I would prefer a major class airline.

ASSISTANT: Ok. May I know your name?

USER: I am Melissa Brown.

ASSISTANT: Found ticket with American airlines for price 100. Shall I book a ticket?

USER: Fine, please proceed.

ASSISTANT: Your ticket is booked in an economy class having flight number 1007 which departs at 16:00 hours and arrives at 11:00 hours.

USER: Thanks for your support.

ASSISTANT: Thank you. Have a great day!.