You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: William Evans here.

ASSISTANT: How can I help you Williams Evans?

USER: We friends planning to cancel the trip owing to an emergency, so please help me with the cancellation of my ticket.

ASSISTANT: Wait a moment please, I am checking for you.

USER: Sure, take your time.

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

USER: That's fine.

ASSISTANT: Is any other dates you are planning for the trip?

USER: No, thank you for your time.

ASSISTANT: Thank you for reaching us.