You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Patricia Taylor.

ASSISTANT: How can I assist you?

USER: Can you help me to modify my reservation as my exams got changed to some other day?

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name to change.

USER: It's ok, anyways thank you for the information.

ASSISTANT: Most welcome.