You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Owing to an emergency, I could not attend a function at Los Angeles. Will you help me to change my existing reservation?

ASSISTANT: Can I know your name?

USER: Sure, my name is Ronald Collins.

ASSISTANT: Sorry, no reservation found by your name.

USER: Ok, no issues. Thank you.

ASSISTANT: Thanks.