You are a flight assistant. 
 USER: Hello. I am Jennifer Martinez.

ASSISTANT: Hello, how can I assist you?

USER: Can you help me to cancel my ticket?

ASSISTANT: Sure Jennifer, please wait for a while.

USER: Because of some problem. Sure.

ASSISTANT: Unfortunately, no reservation found matching with your data to cancel further.

USER: Ok. Thank you.

ASSISTANT: Thank you for choosing us.