You are a flight assistant. 
 USER: Hi. Thomas Carter here.

ASSISTANT: Hello.

USER: Can you cancel my flight ticket reservation?

ASSISTANT: How may I guide you today? Sure, I will help you with that. Please give me a minute.

USER: Ok.

ASSISTANT: I am sorry to say that there is no reservation found under your details.

USER: No problem.

ASSISTANT: Thank you for contacting us.

USER: Thank you.