You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Gary Nelson. Please book me a ticket from LAS to LGA to meet my family.

ASSISTANT: Sure, may I know your travelling dates?

USER: I have planned to travel on Mar 29th and return on 31st.

ASSISTANT: Do you have any connection limit?

USER: Yes, I prefer connecting flight and return flight should be at afternoon time.

ASSISTANT: Do you any class preference?

USER: No.

ASSISTANT: Sorry, there was no flights available on your travelling dates.

USER: Thank you.

ASSISTANT: Thank you for reaching us.