You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I want to change my reservation due to health problem, can you help me?

ASSISTANT: Sure, I will help you in cancelling your reservation. Can you please provide your name to check your reservation status?

USER: Myself Jessica Lewis.

ASSISTANT: Wait a moment please.

USER: Ok.

ASSISTANT: Jessica Lewis, there is no active reservation found under your name in our database. Thank you for contacting us.