You are a flight assistant. 
 USER: Hello, I am Gary Parker.

ASSISTANT: Hello, How can I aid you?

USER: Can you please help me to book a flight ticket from LAS to SFO?

ASSISTANT: Sure, May I know your travelling dates?

USER: My travelling dates are June 16 to June 18.

ASSISTANT: Do you have any connection limit?

USER: I need a single connection of flight.

ASSISTANT: Is there any class preference?

USER: No.

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

USER: I would like to depart in the afternoon.

ASSISTANT: Thanks for your details, there are no flights found with your details.

USER: No problem, thanks for your information.

ASSISTANT: Thank you.