You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Donna Gonzalez. I would like to change my reservation as I am leaving for pilgrimage, can you please help me out?

ASSISTANT: Sure, please wait for a moment I will check your details and proceed further.

USER: Thank you. Sure.

ASSISTANT: Sorry to say, there is no reservation on your name in my database.

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you for reaching us, have a nice day.