You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: My name is William Thompson. Owing an emergency, I want to cancel my cancel my reservation. Can you help me for that?

ASSISTANT: Sure, please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, there was no reservation found with your given name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.