You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I want to change my travel dates, due to some health problems I am unable to travel those dates, can you please change my reservation?

ASSISTANT: Sad to hear that. Sure, I will help you.

USER: Thank you.

ASSISTANT: May I know your name?

USER: Sure, my name is Richard Robinson.

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

USER: Oh! It's ok no problem.

ASSISTANT: Thank you reaching us.

USER: Thank you for your information.