You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How may I help you?

USER: Can you please help me in changing my existing reservation?

ASSISTANT: Please provide your name?

USER: Myself Thomas Whie. Thomas White.

ASSISTANT: Reservation found. Please mention your travelling codes?

USER: My travelling codes are PHL to DCA.

ASSISTANT: Please specify travelling dates?

USER: My travelling dates are 10/12 and 10/14.

ASSISTANT: Ticket can be booked with flight connections 1 having number 1012. Airline is Southwest with price 100.

USER: Ok, please proceed.

ASSISTANT: Ticket is booked.

USER: Thank you.

ASSISTANT: Thanks.