You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Nicholas Robinson.

ASSISTANT: How can I help you at this moment?

USER: Due to some personal issues, I would like to change my existing reservation to some other dates. Can you help me?

ASSISTANT: Sure, I will help you with that. Please wait a moment, I will check your previous reservation status.

USER: Ok, take your time.

ASSISTANT: There is no previous reservation found under your name.

USER: Oh! it's ok, no issues. Thank you for the information.

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