Hello.
user
Hello, How can I assist you?
assistant
 I am Nancy Rodriguez want to book  a ticket from DC-IAD. Can you book  a ticket from MA-BOS?
user
Sure, Please help me with your travel dates.
assistant
 My travel dates are 12/18 and 12/20.
user
Please wait a minute.
assistant
Ok'.
user
No flights available on your particular dates of journey. Thank you for availing us.
assistant
Thank you for your help.
user