You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you today?

USER: Can you please help me in booking my flight ticket from IAD to SEA?

ASSISTANT: Sure, we are here to help you. May I know your itinerary dates?

USER: Thank you and my itinerary dates are from 05/07 to 05/09.

ASSISTANT: Is there any class preference for you?

USER: No.

ASSISTANT: Do you need any way station in your journey?

USER: Yes, I need a single way station in between my journey.

ASSISTANT: Is there any specific time to travel?

USER: No.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: May I know your name please?

USER: Myself Sandra Moore.

ASSISTANT: We are regret to inform you that, there are no flights are available with your requests.

USER: It's ok, thank you.

ASSISTANT: Thank you for opting us.