You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How shall I help you?

USER: I need to book a flight ticket on the name of Alexander Scott. Can you help me with it?

ASSISTANT: Definitely. Please provide your travelling codes.

USER: My journey is from OAK to PHX.

ASSISTANT: May I know your departure date.

USER: I will depart on 03/10.

ASSISTANT: And return date will  be?

USER: I need to catch a return flight on 03/12.

ASSISTANT: Connecting flight with price 600 is available.

USER: Is there any flight within the price limit of 200?

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: No flight is available within the price of 200.

USER: Ok, thank you for your assistance.

ASSISTANT: Thanks.