You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Thomas Williams.

ASSISTANT: How may I address you today?

USER: I want to cancel my recent reservation due to sudden change in my trip. Can you help me?

ASSISTANT: Sure, please wait a moment I will check and revert to you.

USER: That's Fine. Take your time.

ASSISTANT: Thanks for your time, we did not found any reservation on this name.

USER: No issue. Thanks for the information.

ASSISTANT: You're welcome. Have a great day.