You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: My travel trip was postponed and I want to change my reservation, can you help me?

ASSISTANT: Sure, may I know your name please?

USER: My name is Patrick Hall.

ASSISTANT: Sorry Hall, there is no reservation under your name.

USER: Ok, thank you for checking.

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