You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you for the day?

USER: I want to book a direct flight to reach Denver. Can you help me with booking?

ASSISTANT: Sure, I am here to help you with that. May I know your travelling dates, please?

USER: I will travel on Nov 10 and return on Nov 12.

ASSISTANT: May I know your name please?

USER: My name is Sandra Anderson.

ASSISTANT: Can you please share your source code to proceed further?

USER: My source point is IAD.

ASSISTANT: Do you have any class preference?

USER: I need a economy class flight.

ASSISTANT: Is there any other specification for your journey?

USER: No.

ASSISTANT: There are no flights available on this route as per your travel dates.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us, have a great day.