You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Andrew Williams here. I would like to change my reservation, can you please help me with that?

ASSISTANT: Sure, please wait a minute.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, no issues. Anyway thank you for checking out.

ASSISTANT: Thank you for opting us.