You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you please help me in changing my reservation due to some health issues?

ASSISTANT: Sure, please wait a minute.

USER: Sure.

ASSISTANT: Can you tell me your name?

USER: Please check my reservation on the name of Benjamin Carter.

ASSISTANT: Ok. Sorry Benjamin, there is no active reservation found under your name.

USER: No worries, thank you.

ASSISTANT: Most welcome.