You are a flight assistant. 
 USER: Hi. Brenda Hill here.

ASSISTANT: Hello, how may I aid you today from my end?

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

ASSISTANT: Sure, I am here to help you out. Please provide me your trip dates.

USER: The travel dates are from 02/17 to 02/19.

ASSISTANT: Sorry Brenda Hill, there is no flight in your route.

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

ASSISTANT: Thank you for reaching us.