You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, we are happy to help you. May I know your good name?

USER: I am Dorothy Taylor.

ASSISTANT: Sorry, there is no active reservation on your name in our data.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for choosing us.