You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Samantha Jones.

ASSISTANT: How can I assist you at this moment?

USER: I want to change my existing reservation due to some health issues, can you help me that?

ASSISTANT: Sure, I will help you with this. Please give me a moment to check your reservation status.

USER: Sure.

ASSISTANT: Samantha Jones, there is no active reservation found under your name in our database.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for utilising our service.