You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me in changing my recent reservation? as my health is not in a good condition to do journeys.

ASSISTANT: Sure, I will help you. May I know your name please?

USER: Sure, my name is Mark Robinson.

ASSISTANT: Sorry to say, there is no reservation on your name in our database.

USER: Oh! That's ok, thank you for giving the information.

ASSISTANT: Thank you for opting us.