You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Will you please help me in changing my reservation as my plan to go for a trip got postponed?

ASSISTANT: Sure, I am here to help you. May I know your name please?

USER: I am Larry Collins.

ASSISTANT: Ok, please wait a minute.

USER: Ok.

ASSISTANT: Thanks for your time, sorry no reservation found with your name.

USER: It's ok. Thank you for the response.

ASSISTANT: Thank you for reaching us, have a nice day.