You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Nancy Baker here.

ASSISTANT: How can I help you?

USER: Can you please help me in changing my recent reservation? As I have a client meeting in my office on my planned travel dates.

ASSISTANT: Sure, just a moment please.

USER: Sure, please carry on.

ASSISTANT: I am sorry no reservation found on your name in our database.

USER: Oh! That.

ASSISTANT: Thank you for choosing us.

USER: Thank you for giving the information.