You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you today.

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

ASSISTANT: Sure, we are glad to help you.

USER: Thank you.

ASSISTANT: May I know on which name the ticket has been reserved?

USER: Barbara Thomas is my name.

ASSISTANT: Please wait for some time, I will check with your reservation status and revert to you.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for waiting. We are sorry to inform you that, there is no reservation found with your name.

USER: Ok, Not a single problem.

ASSISTANT: Thank you for approaching us. Have a good day.

USER: Thanks for your quick response.