You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be at your service today?

USER: Can you aid me to book a flight ticket from PHL to PHX?

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

USER: My trip dates are Dec 18 and Dec 20.

ASSISTANT: Do you have any other specifications?

USER: I need a connecting flight and depart time should be in the morning.

ASSISTANT: Please help me with your name for booking.

USER: Frank Miller here.

ASSISTANT: Sorry for this inconvenience, I could not find any flight with your requirements.

USER: Thank you.

ASSISTANT: Thank you for reaching us.