You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I already book a flight ticket to MSP, as my trip dates are postponed due to my bad health. Can you change my reservation?

ASSISTANT: Sure, may I know your name?

USER: My name is Brian Thomas.

ASSISTANT: Give me a minute.

USER: Sure.

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

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us.