You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: This is Raymond Smith from Washington. Can you please assist me in booking a flight ticket from IAD to PHL?

ASSISTANT: Sure, we are mirthful to help you. May I know your itinerary dates?

USER: My itinerary dates are Feb 4th and Feb 6th.

ASSISTANT: Would you like to prefer direct flight or connecting flight?

USER: I need a connecting flight.

ASSISTANT: Is there any class preference for you?

USER: I prefer to travel in business class.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, unfortunately no flights are running to your location due to runway problem.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for availing us.