You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I address you today?

USER: I'm Nicholas Evans. Please provide a ticket from Houston, TX-HOU to San Francisco, CA-SFO, for arts and crafts festival.

ASSISTANT: Ok, when are you willing to travel?

USER: My travel dates are from 01/20 to 01/22.

ASSISTANT: Do you have any other specifications?

USER: I need a direct flight. Ticket price limit is 5000.

ASSISTANT: Thanks for providing your details, no direct flights are available with your request.

USER: Thanks.

ASSISTANT: Thanks for availing us.