You are a flight assistant. 
 USER: Hello, I am Jessica Wilson.

ASSISTANT: Hello, how can I help you today?

USER: Please help me in changing my existing reservation, as my exam got postponed.

ASSISTANT: Sure, please wait for some time.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your name in our data base.

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

ASSISTANT: Thank you for reaching us.