You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you today?

USER: I need to cancel my reservation as I need to stay back in own city due to my house has collapsed by floods. Can you help me with the cancellation?

ASSISTANT: Sure, I will help you with that. May I know your name to check your details in our database?

USER: Thank you. I am Sandra Clark.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: Thank you for waiting. I have checked in reservation list to cancel your ticket, but could not find any reservation with your name.

USER: Ok, thanks for the information.

ASSISTANT: Thank you for choosing us.