You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to change my existing reservation due to health issues. My name is Christine Clark.

ASSISTANT: Ok, please stand by I will check the status and get back to you.

USER: Sure.

ASSISTANT: Thank you, sorry no reservation found with your name.

USER: No problem, thanks for your help.

ASSISTANT: Thank you for reaching us, have a nice day.