You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Ashley Allen.

ASSISTANT: Allen, how may I help you?

USER: Can you help me in booking from BOS to DCA, as there is a musical concert at Washington?

ASSISTANT: Sure, please provide your itinerary dates.

USER: My journey dates are 12/07 to 12/09.

ASSISTANT: Please wait for a while. Let me check for a best flight on your route.

USER: Sure.

ASSISTANT: Sorry, no flight is available on your route.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for contacting us.

USER: You are welcome.