You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Daniel Wilson. I am planning to travel to Boston, to watch Baseball match between Boston and Washington teams.

ASSISTANT: Ok, can I know your travelling dates?

USER: I am departing on 09/27 and return on 09/29.

ASSISTANT: Can you provide me the airport codes?

USER: My departure airport is IAD and destination airport is BOS.

ASSISTANT: Ok, please wait a moment I will check for availability of flights.

USER: Ok.

ASSISTANT: Sorry no flights found for your dates.

USER: That's ok, I will check for other alternative. Thanks for your service.

ASSISTANT: Thank you for choosing our services.