You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help?

USER: I am Robert Evans. I would like to book a flight ticket from SFO to LAS to meet my friends. Could you please help me with booking a connecting flight?

ASSISTANT: Sure, I am here to help. Please provide your planned travel dates.

USER: Sure, my travelling dates are Aug 2 and Aug 4.

ASSISTANT: Do you prefer a connecting flight?

USER: Yes, I need a connecting flight.

ASSISTANT: Do you have any other preference?

USER: No, I do not need any other preference.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry we don't have any flight available on given dates by you.

USER: No worries, thank you for the information.

ASSISTANT: Thank you.