You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,.

USER: I am Michelle Roberts.

ASSISTANT: How best I can help you for the day?

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

ASSISTANT: Sure, we can help you. Please wait for a while.

USER: Sure.

ASSISTANT: Sorry we could not find any reservation with your name.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for choosing us.