You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: My name is Christopher Evans. I want to cancel my previous reservation due to terrorist attacks in Paris, can you help me?

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

USER: Ok, take your time.

ASSISTANT: I am sorry to say that there is no reservation found under your name.

USER: Oh! That's very sad to hear from you. Anyways, thank you for checking.

ASSISTANT: Thank you for contacting us.

USER: You are most welcome.