You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hi. How can I help you?

USER: Due to some business work, I want to postponed my trip. Can you change my recent reservation?

ASSISTANT: Sure, may I know your name?

USER: It's alright, thank for your help. My name is Barbara Young.

ASSISTANT: I am sorry , no reservation found on your name.

USER: Ok, It's alright, anyway thank you for your valuable information.

ASSISTANT: Thank you.