You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: Please help me to book a flight ticket from LGA to PHL.

ASSISTANT: Sure, may I know your planned travel dates?

USER: My journey dates are from Dec, 28 to Dec, 30.

ASSISTANT: Do  you have any limits on number of connections?

USER: I need a single connecting flight.

ASSISTANT: Do you have any another specifications on your journey?

USER: No.

ASSISTANT: may I know your name for the booking process?

USER: William Perez.

ASSISTANT: Sorry, no flights are available on your required dates.

USER: Thank you for your information.

ASSISTANT: Welcome, thank you for opting us.