You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: My exams got postponed to other dates, Can you please change my existing reservation?

ASSISTANT: Sure, May I know your name?

USER: Sure, please check the reservation on the name of Timothy Rodriguez.

ASSISTANT: Please wait a second.

USER: Sure, I will wait.

ASSISTANT: Sorry, No reservation found on your name.

USER: Ok, Thank you for your help.

ASSISTANT: Thank you for availing us.