You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Is there any help that you are seeking from my side?

USER: I am facing an issue in my office due to some important meeting that is going to be held, so I would like to change my previous flight ticket reservation, can you please help me in changing?

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you.

ASSISTANT: Can I have your good name please?

USER: My name is Sandra Rodriguez.

ASSISTANT: Ok, please give me a minute to check your ticket status.

USER: Ok, take your own time.

ASSISTANT: Sorry to inform you, there is no reservation found with the name that you have provided.

USER: It's ok, thank you for checking.

ASSISTANT: You are most welcome and have a nice day.