You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I provide assistance to you?

USER: Can you help me to change my reservation?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: I am Timothy Thompson.

ASSISTANT: Ok, please be on hold for some time.

USER: Sure, take your time.

ASSISTANT: Sorry, we could not find any reservation with your name.

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

ASSISTANT: Thank you for availing us.