You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I want to travel from PHL to IAD, can you book the ticket for me?

ASSISTANT: Sure, can you please provide travel dates?

USER: My preferable dates are from 04/25 till 04/27.

ASSISTANT: May I know your name to proceed further?

USER: My name is Alexander Roberts.

ASSISTANT: Alexander, there is a flight available with UA airline and the price 400. Shall I proceed to book a flight ticket?

USER: Ok, please proceed it.

ASSISTANT: Your booking is confirmed with 1001 flight number.

USER: Thank you for your help.

ASSISTANT: You are welcome. Thank you for contacting us.