You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to change my existing reservation, due to my exams has been postponed. Can you help me to change it on the name of Samantha Wright?

ASSISTANT: Sure, we are here to help you. Wait a minute.

USER: Sure.

ASSISTANT: There was no reservation found on your name in our database.

USER: Ok, thanks for your information.

ASSISTANT: Thank you for reaching us.