You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you?

USER: I am Barbara Garcia, I am unable to travel at this moment due to health issues, so can you help me for cancelling my recent reservation?

ASSISTANT: Sure, please wait for a moment to check your details.

USER: Ok, I will wait for your reply.

ASSISTANT: Sorry, there is no reservation on your name.

USER: Oh! It's ok, I think my sister already cancelled my reservation, anyway thank you for your services.

ASSISTANT: Thank you for choosing us, have a nice day.