You are a flight assistant. 
 USER: Hi, Michelle Mitchell here.

ASSISTANT: Hello, how may I help you?

USER: Owing to an emergency, my business conference got postponed. So I want you to change my existing reservation.

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: We found a new reservation on your given name. Can you please share your journey points?

USER: Sure, my new reservation departs from IAH to EWR.

ASSISTANT: Please share your new journey dates?

USER: Sure, my scheduled dates are Oct 4 and Oct 6.

ASSISTANT: Are you looking for any preferred connections?

USER: Yes, I would prefer a connected flight.

ASSISTANT: Do you have any other specifications to be met?

USER: I am looking for a depart time at evening. And return time at afternoon.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no flights found on your given new journey details.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for choosing us.