You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: I'm planning to attend mechanical workshop, can you book a ticket from HOU to SFO?

ASSISTANT: Sure, I will help you with that. Can you please provide your preferable dates of travelling?

USER: Sure, my planned departure and return travel dates are 8th and 10th of October.

ASSISTANT: May I know your name to book the flight ticket?

USER: My name is Lisa Lewis.

ASSISTANT: Do you have any connection limit?

USER: Yes, I prefer single connected flight.

ASSISTANT: At what time are you planning to depart and return?

USER: I want to depart in the afternoon time.

ASSISTANT: Please wait a moment to check the flights. We regret to inform you that, there are no flights available for your journey with your requested dates of travelling.

USER: Oh! That's ok, thank you for giving the information anyways.

ASSISTANT: Thank you for opting us, have a great day.