You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Can you aid me to book a ticket from LAX to SFO?

ASSISTANT: Sure, I will assist you with that. Can you please mention your preferable travel dates?

USER: My travel dates are Sep 16 and Sep 18 respectively.

ASSISTANT: May I know your name for further process?

USER: Jacob Thomas here.

ASSISTANT: Do you need any specific depart and arrival time for this trip?

USER: My arrival time should be in the evening.

ASSISTANT: Do you have any another specifications?

USER: I prefer for single connecting flight.

ASSISTANT: Ok, please hold on a moment.

USER: Ok.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: Thank you for the help.

ASSISTANT: Thank you for reaching us.