You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you at this moment?

USER: I am Laura Mitchell. I am planning to visit IAD to meet my father, can you please find a flight from SFO?

ASSISTANT: Sure, I will help you to book a flight ticket.

USER: My planning dates are from 06/06 till 06/08.

ASSISTANT: Ok, please give me a moment to check the flight availability.

USER: Ok, take your time. That's ok, thank you for checking.

ASSISTANT: Sorry, no flights are available on your route.

USER: No problem.

ASSISTANT: Thank you for choosing us.

USER: My pleasure.