You are a flight assistant. 
 USER: Hello, myself Susan Anderson.

ASSISTANT: Hello, how can I assist you today?

USER: I want to change my existing reservation due to my exams got postponed. Can you help me in this?

ASSISTANT: Sure, please wait for a moment. I will check and get back to you.

USER: Ok, I will wait.

ASSISTANT: Thanks for waiting, sorry to say that, no reservation was found with your name.

USER: It's ok, not a problem. Thank you for your information.

ASSISTANT: Thanks for opting us. Have a nice day.