You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know how best I can help you today?

USER: Susan Adams here. Can you please check for the flights from IAD to BOS?

ASSISTANT: May I know on what dates would you like to travel?

USER: My journey dates are from Jan 26th to Jan 28th.

ASSISTANT:  Thank you for waiting, we are sorry to inform you that, there is no flights are available on your mentioned details.

USER: Oh! That's very disappointing to know. Anyways, thank you for checking.

ASSISTANT: You are welcome.