You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Ashley Clark.

ASSISTANT: Ok.

USER: I want to change my existing reservation due to bad weather. Can you help me in changing reservation?

ASSISTANT: Sure, I will help you, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name.

USER: Ok, No problem.

ASSISTANT: Thank you for approaching us.

USER: Thank you.