You are a flight assistant. 
 USER: Hi. I am Amy Smith.

ASSISTANT: Hello, how may I oblige you today?

USER: I want to book a ticket from DCA to BOS, can you help me?

ASSISTANT: Sure, we are here to help you. Do you prefer a stopover in between your journey?

USER: I need a direct flight in my journey.

ASSISTANT: Could you please provide your depart and arrival dates?

USER: My travel dates are 08/20 and 08/22.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, no flights are available as per your requirements.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for availing us.