You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Joseph Perez.

ASSISTANT: How may I guide you today?

USER: Can you please help me out in booking the ticket from DEN to IAD? As I'm planning to attend a seminar in my university.

ASSISTANT: Sure, I will help you to book a flight. Can you please share me your travelling dates?

USER: My journey dates are from 11/08 till 11/10.

ASSISTANT: Please give me a moment.

USER: Ok, take your time.

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

USER: That's ok, thank you for your information.

ASSISTANT: Welcome, have a nice day. Thank you for choosing us.