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

ASSISTANT: Hello, how may I help you?

USER: I want to book a flight ticket from Boston to visit Olympic National Park in Washington, can you please help me to book a flight ticket with single connection?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: I intend to start on Jan 27th and my return date will be on Jan 29th.

ASSISTANT: May I know your airport codes?

USER: My boarding and landing airport codes are BOS and DCA.

ASSISTANT: May I know your depart and return timings?

USER: I need to return in afternoon.

ASSISTANT: Sorry to inform you that unfortunately there is no flights available by the given details.

USER: No issues, I'll choose any alternative to reach my destination.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.