You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Betty Taylor here.

ASSISTANT: Betty Taylor, how can I help you?

USER: I want to change my existing reservation due to the cloud, will you help me over that?

ASSISTANT: Yes, sure I will help you with it.

USER: Ok.

ASSISTANT: Betty Taylor, sorry to say this there is no flight under your name.

USER: Ok, no issues. Thank you for your quick response.

ASSISTANT: Thank you for contacting us.

USER: Welcome.