You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is William Mitchell.

ASSISTANT: How can I assist you Mitchell?

USER: I am looking for an economy class ticket to fly from Washington. Can you help me in booking a ticket?

ASSISTANT: Sure, can you please share your travelling dates Mitchell?

USER: I wish to travel on 06/03 and return on 06/05.

ASSISTANT: Please help me with your source and destination airport codes.

USER: The respective airport codes are DCA and LAX.

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

USER: Sure, please book the ticket.

ASSISTANT: Your ticket has been booked with flight-1018, have a safe journey.

USER: Thank you for your assistance.

ASSISTANT: Thank you so much for choosing us.