You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What type of service do you need from our travel agency?

USER: My name is Susan Thompson, I want to change my reservation as my trip is postponed. Can you help me with that?

ASSISTANT: Sure, I am glad to help you in changing the details. Can you please allow me sometime to search your ticket status?

USER: Sure.

ASSISTANT: Sorry to inform you that, there is no active reservation found with your name in our database.

USER: Thank you for the information.

ASSISTANT: You are welcome. Thank you for reaching us.