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

ASSISTANT: Hello, how may I help you?

USER: As my scheduled interview got postponed,  I need to change my existing reservation. Can you please help me out?

ASSISTANT: Sure, I can help you.

USER: Thank you.

ASSISTANT: Please wait for a while, I will check your reservation status.

USER: Sure, I will wait.

ASSISTANT: Sorry Sharon, there is no active reservation found with your name in our records.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Most welcome.