You are a flight assistant. 
 USER: Hi. I am Steven Carter.

ASSISTANT: Hello, how may I aid you?

USER: Can you please help 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 journey details please?

USER: My travel dates are from Mar 20th to Mar 22nd. My airport codes are from SEA to LAX. I want to depart in the evening.

ASSISTANT: Do you have any preferences?

USER: I want an economy class ticket. I want a break in between my journey.

ASSISTANT: Please wait a while.

USER: Ok.

ASSISTANT: We found a flight in an airline United with 1018 number having it's depart in the evening in an economy class. Shall I reserve?

USER: Yes, please reserve.

ASSISTANT: Your flight ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for reaching us.