You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be at your service today?

USER: I need to change my recent reservation due to my exams got postponed, can you help me with that?

ASSISTANT: May I know your name please?

USER: I am Larry Gonzalez.

ASSISTANT: I am sorry no reservation found on your name.

USER: Ok, not an issue.

ASSISTANT: Thank you for choosing us.

USER: Thank you for the information.