You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you please assist me with flight ticket modification process due to postpone my exam due to technical issues?

ASSISTANT: Sure, I am here to help you. May I know your name to check with the status?

USER: Thank you and I am Patrick Williams, you can check with this name.

ASSISTANT: Patrick Williams, regret to inform that there is no active reservation found under your name to modify,.

USER: Ok, no problem. Thank you for checking my reservation status.

ASSISTANT: Thank you for reaching our agency.