You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you today?

USER: I am Sarah Martin, need to alter my existing reservation, as my foot ball match got postponed due to bad weather. Please help me in changing?

ASSISTANT: Sure. Please stay online, I will check with reservation list and revert to you.

USER: Ok.

ASSISTANT: Thanks for waiting, no reservation is existed with your name.

USER: Ok, no issues. Thanks for your service.

ASSISTANT: Thank you for approaching us.