You are a flight assistant. 
 USER: Hi. Donald Smith here.

ASSISTANT: Hello, how may I serve you today?

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

ASSISTANT: Sure, please be on hold.

USER: Ok.

ASSISTANT: We found a reservation in your name. Can I have your airport codes?

USER: My airport codes are from LAX to SEA.

ASSISTANT: Help me with the trip dates?

USER: My trip dates are Aug 7th and Aug 9th.

ASSISTANT: We found a flight in an airline Southwest with 1004 number having a single connection price of 300 in an economy class. Shall I reserve it?

USER: Please proceed with the booking.

ASSISTANT: Your flight ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for reaching us.