You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

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

ASSISTANT: Sure, please share your planned trip dates?

USER: My planning dates are from Oct 26 till Oct 28.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Any other requirements to be met?

USER: I want to depart in evening.

ASSISTANT: May I know your name?

USER: Sure, my name is Anna Williams.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: that's ok, thank you for the information.

ASSISTANT: Thank you for reaching us.