You are a flight assistant. 
 USER: Hi, my name is Steven Robinson.

ASSISTANT: Hello, how can I help you?

USER: Owing to an emergency, my exam got postponed to future dates, so I had a request to you to change my existing reservation?

ASSISTANT: Sure, please wait for a minute.

USER: Sure.

ASSISTANT: There is no reservation found with your name.

USER: Ok, no issues. Thanks for your service.