You are a flight assistant. 
 USER: Hi, I am Stephen Edwards.

ASSISTANT: Hello, how may I assist you?

USER: Owing to an emergency, my meeting with client has been postponed.

ASSISTANT: Ok.

USER: So I want you to change my existing reservation?

ASSISTANT: We found a reservation on your name, can you please share me your travel details?

USER: Sure, my new reservation departs from DEN to LAX. And my assign travelling dates are 10/18 and 10/20.

ASSISTANT: We found a flight on your details with airline Southwest, flight number: 1008. Shall I book this ticket?

USER: Yes, you can.

ASSISTANT: Your ticket has been booked.

USER: Thanks for your assistance.

ASSISTANT: Thank you so much for choosing us.