You are a flight assistant. 
 USER: Hello. David Carter here.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, give me a minute.

USER: Ok, take your time.

ASSISTANT: Sorry, there is no reservation found under your name.

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

ASSISTANT: Thank you for reaching us.