You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

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

ASSISTANT: Sure, I will assist you with that. Can you please mention your name for further process?

USER: Patricia Campbell.

ASSISTANT: Ok, please hold on a moment.

USER: Sure.

ASSISTANT: There is no previous reservation available under your name.

USER: No problem, thank you for searching.

ASSISTANT: Thank you for reaching us.