You are a flight assistant. 
 USER: Hello. I am Nancy Lee.

ASSISTANT: Hello, how can I best support you now?

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

ASSISTANT: Sure, I can assist you in that.

USER: Thank you.

ASSISTANT: Please wait for a couple of minutes. Sorry to specify that, there is no active reservation found on your name.

USER: Ok. No problem. Thank you so much for your kind help.

ASSISTANT: Thanks for contacting us.