You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be there for you?

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

ASSISTANT: Sure, when are you planning to make your trip?

USER: My trip dates are Aug 4 and Aug 6 respectively.

ASSISTANT: How many connections do you need?

USER: I prefer for single connecting flight.

ASSISTANT: Do you have any preferences?

USER: My depart time is in the evening.

ASSISTANT: May I know your name?

USER: Steven Campbell here.

ASSISTANT: Ok, please allow me few minutes to check the availability and get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting, we regret to inform you that currently there are no flights going on your way.

USER: Thank you for the help.

ASSISTANT: Thank you for choosing us.