You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: This is Margaret Lopez.

ASSISTANT: Ok.

USER: Can you please help me in changing my recent reservation as my exams got postponed?

ASSISTANT: Sure, please wait for a minute.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no active reservation found on your name in the database.

USER: That's ok, thanks for checking.

ASSISTANT: Thank you for choosing us.