You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I want to reschedule my recent reservation as my movie inauguration got postponed. Can you help me in changing?

ASSISTANT: Sure, may I know your name to proceed further?

USER: I am David Campbell.

ASSISTANT: Thank you, sorry no reservation found with your name.

USER: Its Ok.

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

USER: Thanks for your response.