You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am William Thompson.

ASSISTANT: How can I assist you today?

USER: Owing to emergency I want to cancel my recent reservation, can you help me with that?

ASSISTANT: Sure, will you please give me a moment?

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found under your name.

USER: No problem, thank you for the information.

ASSISTANT: Welcome, have a great day.