You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. Can you please tell me how may I assist you?

USER: Can you please help me with changing my recent reservation?

ASSISTANT: Sure, I am happy to help you to change the ticket details.

USER: Thank you.

ASSISTANT: With which name you have reserved the past ticket?

USER: My name is Nancy Miller.

ASSISTANT: Ok, please allow me sometime to check your ticket status.

USER: Ok.

ASSISTANT: Sorry to inform you that, there is no active reservation found with your name to modify the details.

USER: Ok, no issues. Thanks for the help.

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