You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: William Garcia here.

ASSISTANT: How may I help you?

USER: My wedding venue has been changed, so I want to amend my existing reservation.

ASSISTANT: Sure, I will help you with that. Please wait.

USER: Sure.

ASSISTANT: Your reservation is found. Please tell me your travel dates?

USER: My itinerary dates are Mar 4 and Mar 6.

ASSISTANT: Your airport codes please?

USER: I want to travel from IAD to PHL.

ASSISTANT: May I know your departure and return time please?

USER: I want to depart in the afternoon.

ASSISTANT: Do you have any other preferences?

USER: I need a connecting flight.

ASSISTANT: Thanks for your patience. I have found spirit airlines which flies with one connection. It departs at 16:00 PM and arrives at 08:00 AM.

USER: Please book my ticket.

ASSISTANT: Yes, I have confirmed your flight ticket with flight number 1004.

USER: Thank you for assisting me.

ASSISTANT: Thank you.