You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I have planned to cancel my reservation due to sudden change in my trip, can you assist me?

ASSISTANT: Sure, may I know your name?

USER: Michelle Lee.

ASSISTANT: Please give me a moment to check your ticket status.

USER: Sure.

ASSISTANT: Sorry Michelle Lee, no reservation is available by your name.

USER: No problem, thank you for searching.

ASSISTANT: Thank you for reaching us.