You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Andrew Phillips. I want to change my reservation, can you help me?

ASSISTANT: Sure, please wait for a moment to check your details.

USER: Ok.

ASSISTANT: Sorry, no reservation found on your name.

USER: That's ok. Thank you.

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