You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: I have made a reservation earlier to attend a seminar in my college but due to sudden change in the dates I want to change my existing reservation. Can you help me in doing that?

ASSISTANT: Sure, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to say, no reservation found with your name.

USER: Ok, no issues.

ASSISTANT: May I know your name?

USER: Sure, Jessica Campbell here.

ASSISTANT: Thanks for reaching us.

USER: Thank you for your kind information.