You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you today?

USER: I am Alexander Mitchell. I want to book a flight ticket from Denver to Houston, could you please help me in booking a flight ticket within my price limit of 500?

ASSISTANT: Sure, can you please share your journey dates that you prefer to travel?

USER: I want to fly on 02/10 and return on 02/12.

ASSISTANT: Help me with your depart and arrival airport codes.

USER: My airport codes are CO - DEN, TX - IAH.

ASSISTANT: Ok, please wait a moment, let me search a flight for you.

USER: Sure.

ASSISTANT: Thank you for waiting, we found a connecting flight in Delta airline has fare 100. Shall I proceed?

USER: You can proceed to booking.

ASSISTANT: Your booking has been done.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.