You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

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

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

USER: Sure, my name is Anna Lopez. I will wait for your response.

ASSISTANT: Thank you for your patience. Sorry, we couldn't found any reservation in our database.

USER: Ok, thanks for your information.

ASSISTANT: Thank you for choosing us.