You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Larry Campbell. Owing to an emergency, I want to change an existing reservation. Could you help me in changing the reservation?

ASSISTANT: Sure, please wait for a minute I will check with the current status.

USER: Ok.

ASSISTANT: Unfortunately, there is no reservation found with your name.

USER: Not an issue.

ASSISTANT: Thank you for availing us.

USER: Thank you.