You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: David Wilson here.

ASSISTANT: How can I help you?

USER: I would like to cancel my recent reservation because of some work, can you help me with this?

ASSISTANT: Sure, I will help you. Please, wait a minute.

USER: Thank you, I will wait for your response.

ASSISTANT: Thank you for waiting, I did not find any reservation on your name to cancel.

USER: That's fine, thanks for your help and information.

ASSISTANT: Thank you for approaching us.