You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Catherine Lewis. I made a reservation earlier to attend for food festival but, unfortunately it got delayed. Will you help me in changing my existing reservation?

ASSISTANT: Sure,please wait a minute.

USER: Sure.

ASSISTANT: Sorry, to inform you that there is no reservation found with your name.

USER: It's ok, not an issue. Thank you for the information.

ASSISTANT: Thank you for reaching us.