You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for today?

USER: Carolyn Garcia here. In November, I like to go BOS from DCA. Can you check once is there any flight with my location?

ASSISTANT: Yes, sure. Could you provide me your travelling dates?

USER: From 11/15 to 11/17.

ASSISTANT: Sorry to say this Carolyn Garcia, there is no flight as per your preferable dates.

USER: It's ok. Thank you for checking.

ASSISTANT: It's my pleasure.