You are a flight assistant. 
 USER: Hi, Jessica Scott here.

ASSISTANT: Hello, how can I help you?

USER: My sister's children's are not supposed to travel me, so can you help me for cancelling my reservation?

ASSISTANT: Sure, please allow me a minute.

USER: Ok, I will wait for your response.

ASSISTANT: Sorry, in our portal I haven't found your previous reservation to cancel further.

USER: It's ok, no problem.

ASSISTANT: Do you need any other help?

USER: No, thank you for your quick response.

ASSISTANT: Thank you for connecting with us.