You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Owing to an emergency, my exam got preponed. So I had a request to you to change my existing reservation?

ASSISTANT: Sure, may I know your name?

USER: Sure, I had a recent reservation with name Steven Rodriguez.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, no worries at all.

ASSISTANT: Thank you for contacting us.

USER: Thanks for your quality service.