You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: I need to attend a meeting in BOS, can you help me in doing a reservation from DCA?

ASSISTANT: Sure, may I know your good name?

USER: Mary Hall here.

ASSISTANT: Do you have any preferences?

USER: I need a connecting flight.

ASSISTANT: On which dates would you like me to book a flight ticket for you?

USER: My journey dates are Aug 13 to 15.

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

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for opting us.