You are a flight assistant. 
 USER: Hello. I am John Smith.

ASSISTANT: Hello, how can I provide assistance to you?

USER: I need to book a ticket to meet my uncle and aunt for attending an retirement function  of my grandfather.

ASSISTANT: Ok.

USER: Could you please help me in booking a ticket to DCA?

ASSISTANT: Sure, I am perky to help you. May I know your source airport code?

USER: My source code is OAK.

ASSISTANT: Do you have price limit?

USER: Price should be below 200.

ASSISTANT: Please share your travelling dates.

USER: My travelling dates are 01/13 and return on 01/15.

ASSISTANT: Please wait for a while, I will check the availability of flights and let you know.

USER: Sure.

ASSISTANT: Thank you for being patience. I am here to inform you that, there is a flight available with Hawaiian airline, flight number 1008 with one lay by. Shall I proceed to reserve?

USER: You can proceed.

ASSISTANT: Your flight has been confirmed with ticket having fare 200.

USER: Thank you for booking a ticket.

ASSISTANT: Thank you for reaching us.