You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Cynthia Allen.

ASSISTANT: How can I assist you?

USER: Owing an emergency, I want to change my existing reservation. Could you please help me in that?

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name to cancel.

USER: No problem, I will find my alternative. Thanks for your information.

ASSISTANT: Thank you for reaching us.