You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you?

USER: I want to reschedule my recent reservation as my trip got postponed. Please help me with it.

ASSISTANT: Sure, I can help you. Can I know your name?

USER: I am Raymond Baker.

ASSISTANT: We didn't found any reservation by this name.

USER: That's Ok. Thanks for your assistance.

ASSISTANT: Thank you for picking us.