You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Katherine Harris.

ASSISTANT: How can I aid you at this moment?

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

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

USER: Thank you.

ASSISTANT: Please give me a moment to check your reservation status.

USER: Sure, take your time.

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

USER: No problem, thank you for the information.

ASSISTANT: Thank you for opting us.