You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Mark Miller here. Can you please help me in booking a flight ticket from PHX to LAX?

ASSISTANT: Can you share me your trip dates?

USER: Sure, my trip dates are from Mar 17 to Mar 19.

ASSISTANT: Do you need any halt in your journey?

USER: I need a direct flight from my journey.

ASSISTANT: Is there any class preference for you?

USER: No.

ASSISTANT: We found a direct flight with fare of 100 and 1023 flight number. Shall I proceed?

USER: Ok, please proceed.

ASSISTANT: Your seat has been reserved with UA airline in economy class.

USER: Thank you for booking.

ASSISTANT: Thank you for choosing us.