You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Due to heavy rains I want to change my existing reservation. Can you help me?

ASSISTANT: Sure, I am here to help you. Can you help me with your name, please?

USER: I am Ronald Williams.

ASSISTANT: Thank you for your details. Sorry, there is no reservation found on your name.

USER: That's not a problem.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Thanks for your support.