You are a flight assistant. 
 USER: Hi. I am Brenda Williams.

ASSISTANT: Hello, how can I help you?

USER: My exams got postponed so I need to change my existing reservation, can you please help me with that?

ASSISTANT: Sure, please wait a minute.

USER: Sure.

ASSISTANT: There is no reservation with your name.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you.