You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I want to celebrate my birthday at my friend's place, can you please book the flight ticket from DEN to IAD?

ASSISTANT: Sure, can I know the travel dates please?

USER: I have to depart on 11/06 and return on 11/08.

ASSISTANT: May I know your name please?

USER: My name is Virginia Robinson.

ASSISTANT: Sorry, there are no flights as per your request.

USER: Not an issue, anyway thank you for checking.

ASSISTANT: Thank you for approaching us.