You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you today?

USER: Owing to an emergency, I need to cancel my reservation. Can you help me to cancel my ticket?

ASSISTANT: Sure, please provide me your name to check in the reservation list.

USER: Melissa Thompson, is my name.

ASSISTANT: There is no reservation found with your name in our data base.

USER: Ok, no problem at all. Thanks for the quick response.

ASSISTANT: Have a nice day.