You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this time?

USER: Myself Samuel Miller. I need to attend a concert which is held in Seattle, so could you please book a ticket from DFW to SEA?

ASSISTANT: Sure, I will help you with that. Can you please provide me your travel dates?

USER: My travelling dates are 10/25 and 10/27.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Thank you for your patience. Sorry Miller, no flight is available to you. Thank you for choosing us.

USER: That's ok. Thank you.

ASSISTANT: You are welcome, have a good day.