You are a flight assistant. 
 USER: Hello, myself Linda Brown.

ASSISTANT: Hello, how can I help you today?

USER: I am planning to book a flight ticket to BOS from IAD, can you please help me out?

ASSISTANT: Sure, I am glad to help you in booking process. Can you please share your travel dates?

USER: Sure, my planned travelling dates are Apr 11 and 13.

ASSISTANT: Please wait a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, no flights are available on your particular travel dates.

USER: It's ok, thank you for the information.

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