You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, How may I help you?

USER: I want to book a flight ticket with the name Mark Walker.

ASSISTANT: Sure, Please help me with your journey details?

USER: I have planned to travel from Las Vegas, NV- LAS to Oakland, CA- OAK . Also my depart date is on 30th June  and return date is on  2nd July.

ASSISTANT: OK, Do you have any other specifications?

USER: I don't have a connection limit but I have a price limit of 1000 and Airline preference as normal-cost.

ASSISTANT: OK, Please wait I will revert you back in a while.

USER: OK, Sure.

ASSISTANT: May I know your name?

USER: I have already mentioned my name.

ASSISTANT: Sorry for the inconvinience. Thank you for being patience. Sorry, They were no flights available as per your requirement.

USER: OK, Thank you for your service.