You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you?

USER: I want to cancel my reservation because my trip has been postponed, can you assist me?

ASSISTANT: Sure, may I know your name?

USER: Margaret Jackson.

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

USER: Sure.

ASSISTANT: Sorry Margaret Jackson, no reservation is available by your name.

USER: No problem, thank you for searching.

ASSISTANT: Thank you for reaching us.