You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Ryan Lopez. I had done my flight ticket booking last week to spend a time with my family.

ASSISTANT: Its great.

USER: But due to some rain I would like to change my existing reservation.Can you help me out of it?

ASSISTANT: Sure, let me check.

USER: Ok.

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

USER: Ok, thank you for the information.

ASSISTANT: Thank you for contacting us.