You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Ryan Campbell. Can you please help me in booking my flight ticket from SFO to CLT?

ASSISTANT: Sure, could you please share your travelling dates?

USER: My travelling dates are 04/14 and 04/16.

ASSISTANT: Thank you for your details. Sorry, there is no flight available for you.

USER: Ok, fine thank you for checking.

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