You are a flight assistant. 
 USER: Hello, I am Jacob Lewis.

ASSISTANT: Hello, how may I help you?

USER: Due to heavy rain fall, I want to change my reservation. Can you help me out with it?

ASSISTANT: Ok, please wait I will check the existing reservation on your name in the database and revert you.

USER: OK.

ASSISTANT: Sorry, there is no reservation found on your name to change.

USER: No issues, I will try with another airline.

ASSISTANT: Thank you for opting us.

USER: Thank you for the help.

ASSISTANT: Have a wonderful day.