You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Raymond Smith here.

ASSISTANT: How can I assist you at this moment?

USER: Can you please help me in changing my recent reservation? As my health is not in good condition to do journeys.

ASSISTANT: Sure, I am gleeful to help you with this.

USER: Ok.

ASSISTANT: Raymond Smith, there are no active reservation found under your name in our database to change it.

USER: That's ok, thank you for giving the information.

ASSISTANT: Thank you for utilising our service.