You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Patricia Martin here.

ASSISTANT: How may I help you?

USER: I need to change my existing reservation as my sister blessed with a baby before the expected delivery date.

ASSISTANT: Sure, I will help you. Please wait for a minute.

USER: Ok.

ASSISTANT: Sorry Martin, there is no reservation found based on your name in our database.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you for approaching us.