You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How can I render you today?

USER: I am Raymond Williams. Will you help me in change in existing reservation? Because my business got postponed.

ASSISTANT: Sure, we are here to help you. Give me a minute, I will check the reservation and revert to you.

USER: Thank you. Ok.

ASSISTANT: Thanks for your time, we could not find any reservation with your name Raymond Williams.

USER: Ok. Thanks for sharing the information.

ASSISTANT: Thank you for availing us.