You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Mark Adams.

ASSISTANT: How may I aid you?

USER: I need to amend my reservation due to some issues, can you help me out?

ASSISTANT: Sure, I am here to help you. Please wait for a while.

USER: Thank you and take your own time.

ASSISTANT: Sorry to inform you that there is no reservation found on your given name.

USER: That's ok, not an issue. Thank you.

ASSISTANT: Thanks for reaching us, have a nice day.