You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I am Helen Walker want to book a flight ticket with price under 500, can you please help me with it?

ASSISTANT: Sure, please help me with your airport codes?

USER: Ok, I would like to start from DC-IAD to CA-OAK.

ASSISTANT: Ok, let me know your connection limit?

USER: Sure, I need a connection in between.

ASSISTANT: Ok, when are you planning to travel?

USER: I have planned to start on 12/12 and return on 12/14.

ASSISTANT: Ok, please wait I will get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting, flight- 1004, airline- Delta, price- 100 with connection- 1 matches your requested details. Shall I proceed?

USER: Yes, please.

ASSISTANT: Ok, your ticket has been reserved.

USER: Thank you.

ASSISTANT: Thank you for connecting with us.