You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: Nancy Rodriguez here. Can you please help me in changing my recent booking?

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

USER: Sure, I'll wait.

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

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

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