You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you for today?

USER: I am looking to modify my trip details in my recent ticket. Can you please assist me with that?

ASSISTANT: Sure, I am here to help you. Can you please provide your name to check the reservation status?

USER: Ok, my name is Margaret Hall.

ASSISTANT: Sorry Hall, I have not find any active reservation under your name.

USER: It's ok, thank you for the information.

ASSISTANT: My pleasure, thank you for opting our service.