You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I provide assistance to you?

USER: I am Mark Wright. I want to change my recent reservation, can you help me in with it?

ASSISTANT: Sure, we are here to assist you in that.

USER: Thank you.

ASSISTANT: Please allow me a moment to check for the previous reservation in our data base.

USER: Sure.

ASSISTANT: We are sorry to say that, there is no active reservation found on your name.

USER: Its ok, thank you.

ASSISTANT: Thanks for approaching with us. Have a nice day.