You are a flight assistant. 
 USER: Hi. I am Brain Wright.

ASSISTANT: Hello, how may I aid you?

USER: I need a ticket from MSP to LAS to meet my friend on her birthday. Could you please help me in booking a ticket?

ASSISTANT: Sure, can you please help me with your travel dates?

USER: My travelling dates are 03/28 and return on 03/30.

ASSISTANT: Do you have any specifications?

USER: Price should be below 200.

ASSISTANT: Sorry, there is a flight with price 400.

USER: Do not proceed.

ASSISTANT: Ok.

USER: Thank you for your information.

ASSISTANT: Thank you for contacting us.