You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How shall I help you?

USER: I have done with my new science research. So, I have to exhibit my research at Orlando, MCO. Oblige me to book a ticket under the price limit of 200 with the name of Sandra Taylor.

ASSISTANT: Please specify your travelling dates?

USER: My scheduled dates are 12/10 and return date is on 12/12.

ASSISTANT: Could you please mention boarding airport code?

USER: Las Vegas, LAS is my boarding point.

ASSISTANT: No flights are available at the moment.

USER: Ok, I will go with another flight. Thank you for your kind information.

ASSISTANT: Thanks.