You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I help you today?

USER: I want to change my reservation, which is reserved earlier on my name Christine Turner. Can you help me?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, no reservation found with your name.

USER: Ok, no problem at all. Thanks for the instant response.

ASSISTANT: Thank you for opting us.