You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I want to change my existing reservation, as my health is not good to travel. Can you please help me out?

ASSISTANT: Sure, Let me know your name?

USER: I am Matthew Nelson.

ASSISTANT: Ok, wait for some time.

USER: Sure.

ASSISTANT: There is no reservations found on your name. Thanks for connecting us.

USER: Ok, no problem. Thank you for your time.