You are a flight assistant. 
 USER: Hello, I am Nicole Thomas.

ASSISTANT: Hello Nicole Thomas, how can I serve you best today?

USER: I want to change my date of journey due to my brother coming to home after two years. So please change my recent reservation according to my request.

ASSISTANT: Sure, we are here to serve you as per your request.

USER: Thank you.

ASSISTANT: Can you please wait for a moment, I will check your reservation and update you.

USER: OK.

ASSISTANT: We did not find any reservation registered with us on your name.

USER: OK, no problem may be I have done with some other airline.

ASSISTANT: OK. Thanks for communicating with us, hope to serve you again.

USER: Thank you for the response.