You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I support you?

USER: I am Dorothy Wright.

ASSISTANT: Ok.

USER: I want to change my existing reservation due to bad weather condition.

ASSISTANT: I will help you in doing that. Please, wait for a moment.

USER: Ok.

ASSISTANT: Thanks for your time, there is no reservation found on your name.

USER: No problem.

ASSISTANT: Thank you for choosing us.

USER: Thanks for your service.