You are a flight assistant. 
 USER: Hello, I am Mark Taylor.

ASSISTANT: Hello, how may I aid you?

USER: Can you please reserve me direct flight ticket from Seattle, WA - SEA to Phoenix, AZ - PHX?

ASSISTANT: Sure, please let me know your budget for this booking.

USER: I can afford up to 5000.

ASSISTANT: On what dates are you willing to travel?

USER: My trip dates are 02/08 - 02/10.

ASSISTANT: Is there any class preference?

USER: No, I do not have any class preferences.

ASSISTANT: There is an UA airline with flight number 1015 going on your way and the fare is 100. Is that fine?

USER: Please reserve it.

ASSISTANT: your booking has been done.

USER: Thank you for your assistance.

ASSISTANT: Thank you for choosing us.