You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Sandra Brown here.

ASSISTANT: How may I help you?

USER: I would like to book a ticket from BOS to JFK, can you please help me with that?

ASSISTANT: Ok, help me with your preferable dates.

USER: The travel dates are from 10/29 to 10/31.

ASSISTANT: Sorry, there is no flight running on your route.

USER: That's ok, thank you for your help.

ASSISTANT: Thanks for reaching us, have a good day.