You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Daniel Allen here.

ASSISTANT: Glad to meet you Allen.

USER: I want to attend a workshop in SFO, so I want to book a ticket from IAD.

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

USER: My departing date is on 02/02 and return on 02/04.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Thank you for waiting. Sorry Allen, there is no flight available to you on your dates.

USER: That's ok, thank you for your information.

ASSISTANT: My pleasure. Thank you for choosing us, have a great day.