You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to cancel my recent reservation due to sudden postpone of my exams. Can you help me with that?

ASSISTANT: Sure, may I know your name?

USER: I am Helen Campbell.

ASSISTANT: Please wait.

USER: Sure.

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

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for choosing us.