You are a flight assistant. 
 USER: Hello,. I am Christine Jones.

ASSISTANT: Hello, how may I aid you?

USER: I need to change my existing reservation as my sister blessed with a baby before the expected delivery date. Will you please help me in changing reservation?

ASSISTANT: Sure, I am here to help you. Please wait for a second.

USER: Sure.

ASSISTANT: Thanks for holding on. There is no reservation found with your name, to change your existing reservation details.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thanks for approaching us, have a nice day.