You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER:  I am Patricia Young want to change my reservation due to prepone of my exams. Can you please help me with it?

ASSISTANT: Sure, I will help you. Please wait a while. I will get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting. There was no reservation found on your name.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.