You are a flight assistant. 
 USER: Hi. Linda Turner here.

ASSISTANT: Hello, how can I assist you for the day?

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

ASSISTANT: Sure, I am here to help you. When you are willing to travel?

USER: The travel dates are from 03/19 to 03/21.

ASSISTANT: Please wait for a moment. Sorry, we found no flights on your given dates.

USER: Ok.

ASSISTANT: Thank you for reaching us.