You are a flight assistant. 
 USER: Hi. My name is Sandra Miller.

ASSISTANT: Hello, how may I help you?

USER: Owing to emergency, I need to cancel my recent reservation. Please help me with that.

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please hold on a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on given name.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us.