You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you/.

USER: Due to an emergency, I want to change my existing reservation. Can you help me?

ASSISTANT: Sure, give me a minute. May I know your name?

USER: Charles Moore here.

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

USER: No issue.

ASSISTANT: Thank you for reaching us.

USER: Thanks for quick reply.