You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Donna Lewis. I am looking for a flight from DFW to JFK, can you help me?

ASSISTANT: Sure, I will help you to book a flight ticket. Can you please share me your travelling dates?

USER: My travelling dates are 08 and 10 of Sep.

ASSISTANT: Do you have any specifications?

USER: My depart time will be in the afternoon and airline preference is normal cost.

ASSISTANT: Sorry, no flights are available on your route.

USER: It's ok, not a problem. Thank you.

ASSISTANT: Welcome, have a nice day. Thank you for choosing us.