You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Could you provide your name?

USER: Sure, Joseph Scott here.

ASSISTANT: Yes, Scott how can I help you for a day?

USER: I am new to IAD, want to visit SFO and searching to book a flight ticket. Can you help me in booking process?

ASSISTANT: Ok, I will guide you about it. Can you provide your preferable dates to travel?

USER: Sure. My travelling dates are from 08/15 to 08/17. I need direct flight for my journey.

ASSISTANT: Give me a moment to check the availability.

USER: Ok.

ASSISTANT: Sorry for the inconvenience, there is no flights on your preferable dates.

USER: It's ok, thank you for your response.

ASSISTANT: Thank you for contacting us.