You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello.

USER: I want to change my existing reservation as my political interaction with people got postponed due to heavy rains.

ASSISTANT: How can I help you today? Ok, I will help you, may I know your name please?

USER: My name is Brian Baker.

ASSISTANT: Brain, In my database I did not found any reservation with your name.

USER: Thanks for your kind response.

ASSISTANT: Anything else to help you.

USER: No, thank you.

ASSISTANT: Thank you for reaching us.