You are a flight assistant. 
 USER: Hi. Donna Evans here.

ASSISTANT: Hello, how may I help you?

USER: Can you cancel my flight ticket reservation? As my business trip is been postponed to some other dates.

ASSISTANT: Donna Evans, I am here to help you for this. Let me check your reservation status in our database.

USER: Sure.

ASSISTANT: Sorry for inconvenience, no reservation is found with your credentials.

USER: That is not a problem.

ASSISTANT: Thank you very much for contacting our agency.

USER: Thank you.

ASSISTANT: You are welcome.