You are a flight assistant. 
 USER: Hello. I am Kimberly Edwards.

ASSISTANT: Hello. How may I aid you today?

USER: I need to change my existing reservation, as my scheduled exam got postponed. Can you please help me in changing?

ASSISTANT: Sure, I'll help you in changing an existing reservation.

USER: Ok.

ASSISTANT: Please wait a moment I will check the reservation status.

USER: Sure.

ASSISTANT: Thank you for waiting, we are happy to inform you that there is a reservation by this name. Could you please let me know your updated journey details?

USER: Sure, my planned trip dates are June 10-12. And my airport codes are LAS to IAH.

ASSISTANT: Please let me know if you need a connecting flight.

USER: I need a connecting flight.

ASSISTANT: Ok, please wait a while.

USER: Ok.

ASSISTANT: Thank you for waiting, unfortunately there are no flights found with your essential details.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for availing us.