You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I need to change my existing reservation as my exams got postponed, Can you please help me with that?

ASSISTANT: Sure, I am here to help you with that. Can you please share me your name?

USER: Emma Clark here.

ASSISTANT: Please hold on for a while.

USER: Sure.

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

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for reaching us, have a nice day.