You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: I am Brenda Green, I want to book a flight ticket from OAK to MSP.

ASSISTANT: Sure, I will help you in booking the ticket.

USER: Thank you.

ASSISTANT: May I know your travelling dates please?

USER: Sure, my travelling dates are 10/21 and 11/02.

ASSISTANT: Ok, please wait a moment.

USER: Ok, sure.

ASSISTANT: Sorry, there are no flights found in our database.

USER: Not an issue, anyway thank you for the help.

ASSISTANT: Thank you for choosing us.