You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: I want to book a flight ticket from LAS to SFO, can you please book a flight ticket for me?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: Yes, my travelling dates are 27 and 29 of April.

ASSISTANT: Can I know your name please?

USER: Yes, my name is Cynthia Green.

ASSISTANT: Do you need any specifications?

USER: I need a connecting flight.

ASSISTANT: Sorry, there are no flights found.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for reaching us.