You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

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

ASSISTANT: Sure, please wait for a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, no reservation found on your name.

USER: It's ok, thank you.

ASSISTANT: Thank you for reaching us.