You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I need to change my recent reservation due to postpone of my exams, can you help me in doing that?

ASSISTANT: Sure, we are happy to help you. Please let me know your good name to proceed further.

USER: I am Janet Davis.

ASSISTANT: Sorry, we did not find any active reservation on your name in our data.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for availing us.