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

ASSISTANT: Hello,. How can I provide assistance to you?

USER: I want to book a flight ticket from CA - OAK to PA - PHL, so please help me in booking a flight ticket.

ASSISTANT: Sure, we are perky to serve you. When did you scheduled to fly?

USER: I would like to fly on 11/18 and return on 11/20.

ASSISTANT: How much you can afford in this journey?

USER: I can afford up to 1000.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: We found a direct flight with price of 100 and 1004 flight number. Shall I proceed?

USER: Don't proceed to booking. I need a halt.

ASSISTANT: Ok,.

USER: Thank you.

ASSISTANT: Thank you for availing us.