You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Justin Campbell, want to alter my recent reservation. Please help me out with that.

ASSISTANT: Ok, I will help. Please can you wait a moment?

USER: Thanks and sure.

ASSISTANT: Ok, thank you for waiting. Sorry, there is no reservation been found on your name to change.

USER: It's ok, thank you.

ASSISTANT: Thank you for assisting me.