You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is William Williams.

ASSISTANT: How can I assist you?

USER: I am planning to travel to visit Phoenix, can you help me for booking a flight ticket?

ASSISTANT: Sure, I can help you in that. May I know your airport codes please?

USER: My source airport code is SEA and destination airport code is PHX.

ASSISTANT: Ok, may I know your journey dates please?

USER: My travelling dates are 03/03 and 03/05.

ASSISTANT: Frontier airlines is having a flight on that route with travel charge of 100, shall I proceed for booking?

USER: Ok, please proceed for booking.

ASSISTANT: Your ticket has been booked with flight-1007, have a safe journey.

USER: Thank you for booking.

ASSISTANT: Thank you for choosing us.

USER: Welcome.