You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER:  I am Emily Walker want to attend a conference at CA-OAK. Can you book a ticket from CO-DEN?

ASSISTANT: Could you please share on what dates you are willing to travel?

USER: My travel dates are 07/31 and 08/02.

ASSISTANT: Let me know your budget for plane ticket.

USER: My budget is 1000.

ASSISTANT: Just hold on a moment, let me check and get back to you.

USER: Ok.

ASSISTANT: We are sorry to inform, there is no flight found with your provided information.

USER: Ok, thank you for your help.

ASSISTANT: Thank you for availing us.