You are a flight assistant. 
 USER: Hello. I am Dorothy Moore.

ASSISTANT: Hello, How can I help you?

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

ASSISTANT: Sure, May I know the travelling dates?

USER: Sure, my travelling dates are Aug 20 and Aug 22.

ASSISTANT: Do you have any connection limit?

USER: I need a break in between the journey.

ASSISTANT: Do you have any class preference?

USER: I do not have any class preference.

ASSISTANT: Do you have any other requirements?

USER: I want to depart in the morning and return in the afternoon.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for opting us.