You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. May I know your good name?

USER: Owing to health emergency, I need to change my existing reservation. Can you help me with it? I am Pamela Lewis.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation exists in your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for availing us, hope to serve you again.