You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I need to change my recent existing reservation due to postpone of my document verification in office. Can you help me update my reservation which was made on the name of Stephen Thompson?

ASSISTANT: Sure,I can help you. Give me a minute.

USER: Sure.

ASSISTANT: Thanks for your time. We didnt found any reservation by this name.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for reaching  us.