You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Virginia Collins.

ASSISTANT: How can I assist you?

USER: Can you help me to book a connecting flight from PHX to PHL?

ASSISTANT: Sure, I can help you with that. May I know your planned travel dates please?

USER: My travelling dates are 18 and 20 of Apr.

ASSISTANT: May I know your class preference please?

USER: No, I would like to depart in the afternoon.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your own time.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates with your given details.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for choosing us, have a nice day.