You are a flight assistant. 
 USER: Hello, I am Helen Thompson.

ASSISTANT: Hello, how can I assist you for the day?

USER: As I am a citizen of Las Vegas I have to attend citizenship day celebration at Las Vegas, NV-LAS. Will you assist me for booking a ticket for Las Vegas from PA-PHL?

ASSISTANT: Sure, I am here to help you. When you are willing to travel?

USER: My travelling dates are from 09/23 to 09/25.

ASSISTANT: Do you have any class preference?

USER: No, I am comfortable with any class.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: We found 1004 Southwest airlines with single connection with price 100.

USER: Sure, you can proceed for booking.

ASSISTANT: Your, booking has been confirmed.

USER: Thank you.

ASSISTANT: Thank you for reaching us.