You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I be of your address?

USER: George Young here, I want to change my existing reservation. due to sudden changes my exams got post poned. Can you please help me with it?

ASSISTANT: Sure, I'll help you. Just hold on I will check is there any reservation with your name. Thanks for waiting, we didn't found any reservation with your name.

USER: Ok. Not a problem, thank you.

ASSISTANT: Thanks for picking us, have a nice day.