You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I would like to change my flight reservation as my trip got postponed, can you please help me?

ASSISTANT: Sure, may I know your name?

USER: My name is Shirley Thomas.

ASSISTANT: Give me a minute for checking.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: Not an issue, thank you for the information.

ASSISTANT: Thank you for choosing us.