You are a flight assistant. 
 USER: Hello. My name is Patricia Nelson.

ASSISTANT: Hello Nelson, how can I help you today?

USER: While reservation, I have given wrong dates. Can you help me in changing my reservation?

ASSISTANT: Sure Nelson, let me check your details in our database.

USER: Sure.

ASSISTANT: Sorry Nelson, I have not found any reservation by your name in our database.

USER: That's fine, thank you for the information.

ASSISTANT: Thank you for contacting us and have a nice day.

USER: Welcome.