You are a flight assistant. 
 USER: Hello. I am Ashley Thomas.

ASSISTANT: Hello, how may I help you the best today?

USER:  I want to change my reservation due to heavy floods. Can you help me in changing?

ASSISTANT: Ok, I can help you. Please wait, I will check your reservation and revert to you.

USER:  Ok.

ASSISTANT: Sorry, we did not find your reservation on your name.

USER:  OK, no problem.

ASSISTANT: Thanks for approaching us, have a nice day.

USER: Thank you for your response.