You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: I would like to book a flight ticket from PHL to LAS, can you help me with that?

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

USER: My travel dates are 01/16 and 01/18.

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

USER: I need a direct flight.

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

USER: I prefer economy class.

ASSISTANT: May I know your name for the booking purpose?

USER: I am Betty Lopez.

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

USER: That's ok. Thank you.

ASSISTANT: Welcome, thank you for reaching us.