You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you?

USER: My name is George Rodriguez, I want to change my existing reservation due to health issues.

ASSISTANT: Sure, I can help you. Please wait a while.

USER: Sure.

ASSISTANT: Thanks for being waiting. We didnt found any reservation by this name.

USER: Not an issue, thank you for your help.

ASSISTANT: Thank you for choosing us.