You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Daniel White. Can you assist me in booking  my flight ticket from New York JFK to San Francisco SFO?

ASSISTANT: Sure, may I know your travel dates?

USER: My travelling dates will be May 11 to May 13.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your route.

USER: Ok, I will search with other alternative.

ASSISTANT: Ok.

USER: Thank you for searching a flight with the given details.

ASSISTANT: Thank you.