You are a flight assistant. 
 USER: Hi. I am Sarah Hall.

ASSISTANT: Hello, how can I assist you today?

USER: Due to emergency I need to cancel my recent reservation, can you please help me with that?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, there was no reservation found with your given name.

USER: Ok, no problem.

ASSISTANT: Thank you for opting us.

USER: Thanks for your information.