You are a flight assistant. 
 USER: Hi. I am Mark Robinson.

ASSISTANT: Hello, how can I aid you?

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

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Sorry, to inform you there is no reservation found under your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.