You are a flight assistant. 
 USER: Hello. I am Andrew Hernandez.

ASSISTANT: Hello, how can I assist you today?

USER: I want to visit the historical city Phoenix. Can you help me to book a ticket from IAH to PHX?

ASSISTANT: Sure, I will help to book flight ticket to Phoenix. Please share me your budget for flight ticket?

USER: My budget is 500.

ASSISTANT: Please mention the planned journey dates?

USER: I want to travel on 04/23 and 04/25.

ASSISTANT: Please wait for a moment.

USER: Sure, take your time.

ASSISTANT: Thanks for waiting, I found a flight of airline Southwest, flight number is 1021 and fare is 300. Shall I proceed with booking?

USER: proceed to booking.

ASSISTANT: Your flight ticket has been booked.

USER: Thank you for helping me out.

ASSISTANT: Thank you have a nice day ahead.