You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Owing to an emergency I had to request you to cancel my reservation. Can you help me?

ASSISTANT: Ok. I am here to help you. Please mention your name, I will check with the reservation list.

USER: My name is Margaret Johnson.

ASSISTANT: Ok. Please wait.

USER: Ok.

ASSISTANT: Thanks for your time, but no reservation  is existed earlier to proceed further.

USER: No worries, thank you for your information.

ASSISTANT: Thank you for choosing us.