You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Sure, may I know your good name please?

USER: Thank you, my name is Ruth Mitchell.

ASSISTANT: Please wait for a moment.

USER: Ok, sure.

ASSISTANT: Sorry, there is no reservation found on your name in our database to change.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you for approaching us.