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

ASSISTANT: Hello. How can I aid you?

USER: I am planning to visit culture and fine arts expo at Dallas, help me in  booking my flight ticket from CA-SFO.

ASSISTANT:  May I know your travel dates?

USER: My travelling dates will be 09/03 to 09/05.

ASSISTANT: Sure, provide me your destination point?

USER: My destination point is TX-DFW.

ASSISTANT:  Ok, please wait.

USER: Sure.

ASSISTANT:  Sorry, no flights are available on your requested dates. Thank you for availing us.

USER: Its ok.