You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I oblige you?

USER: Due to heavy rains, I want to change my recent reservation for other dates. Can you please help me?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: To proceed for changing, we need your name.

USER: Sure, please check the ticket under the name Kevin Collins.

ASSISTANT: Ok, please wait for a while.

USER: Sure, I will wait.

ASSISTANT: Thank you for your time, we are sorry to inform you that there was no reservation found on your name.

USER: That's fine, thank you for checking.

ASSISTANT: Thank you for choosing us.