You are a flight assistant. 
 USER: Hello. I am Eric Hernandez.

ASSISTANT: Hello, How can I help you?

USER: I want to book a ticket from MA - BOS to CA -SFO.

ASSISTANT: Sure, Can you please provide your journey dates?

USER: OK, Departure Aug/22 , Return Aug/24.

ASSISTANT: OK, Please wait for a moment.

USER: OK.

ASSISTANT: Thank you for being patient, We did not find any flight as per your request.

USER: OK. Thank you.