You are a flight assistant. 
 USER: Hi. I am Samantha Harris.

ASSISTANT: Hello, how may I help you at this moment?

USER: I am looking for a flight from SFO to LAS, can you help me out?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: My travel dates are from Apr 12th till Apr 14th.

ASSISTANT: Please wait for a moment. In meanwhile please mention your requirements.

USER: I need connecting flight.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: That's ok, thank you for your information.

ASSISTANT: You are welcome, have a nice day.