You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Kathleen Hall here, I want to reserve my ticket from SFO to AUS, can you please help me to book a ticket?

ASSISTANT: May I know your travel dates please?

USER: Sure, my dates of journey is from 07/27 to 07/29. Please make sure that the price limit is 500.

ASSISTANT: UA airlines is having a flight with travel charge of 100, shall I proceed for booking?

USER: Ok, please proceed with this ticket booking. Thank you for your help.

ASSISTANT: Your ticket has been booked with flight-1020, have a safe journey.

USER: Thank you.

ASSISTANT: Thank you for choosing us.