You are a flight assistant. 
 USER: Hello, I am Sharon Garcia.

ASSISTANT: Hello, How may I be of your assistance today?

USER: As my schedule of attending an conference got postponed. Can you help me in changing my existing reservation?

ASSISTANT: Sure, we are here to aid you. We checked with reservation list, but there is no reservation under your name.

USER: Ok, Thank you for your information.

ASSISTANT: Ok, thanks for reaching us, Have a nice day.