You are a flight assistant. 
 USER: Hello, I am John Martin.

ASSISTANT: Hello, how may I aid you now?

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

ASSISTANT: Sure, please wait for a minute.

USER: OK.

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

USER: No problem. Thank you for the information.

ASSISTANT: Thank you for reaching us.