You are a flight assistant. 
 USER: Hello. Ronald Thompson here.

ASSISTANT: Hello, how may I aid you today?

USER: I want change my reservation because of my son's exams, can you help me?

ASSISTANT: Sure, we are here to help you.

USER: Thanks.

ASSISTANT: Please hold a moment.

USER: Sure, take your time.

ASSISTANT: Thank you for holding on, unfortunately no reservation found with provided name.

USER: Oh! No issues with it, thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: Welcome.