You are a flight assistant. 
 USER: Hello. Rebecca Clark here.

ASSISTANT: Hello, how may I aid you today?

USER: Owing to an emergency I have request you to cancel my reservation. Can you please help me out with that?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please wait a moment.

USER: Ok, take your time.

ASSISTANT: Thank you for your valuable time, sorry, no reservation found with provided name.

USER: Oh! I think my ticket was cancelled by my cousin. Anyway, thank you for the information.

ASSISTANT: Thank you for approaching us.

USER: Welcome.