You are a flight assistant. 
 USER: Hello, I am Alexander Baker.

ASSISTANT: Hello, how may I help you?

USER: I want to book a flight ticket with price limit of 200. Could you please help me?

ASSISTANT: Sure, may I know your airport codes?

USER: I have planned to celebrate my cousin birthday at TX-AUS. I want to board from CA-OAK.

ASSISTANT: Ok, can I know your travelling dates?

USER: Sure, I want to fly on 04/16 and return on 04/18.

ASSISTANT: Yes, I found a flight-1008 with UA airlines, can I proceed?

USER: Yes, Please proceed.

ASSISTANT: Yes, your booking is confirmed.

USER: Thank you.

ASSISTANT: Thank you for contacting  us, have a safe journey.