You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: Owing to an emergency I had to request for change reservation. Can you please help me to change an existing reservation?

ASSISTANT: Sure, please wait for a minute. May I know your name?

USER: My name is Andrew Rodriguez.

ASSISTANT: There is no reservation found with your name.

USER: That's ok,. Thanks for your information.

ASSISTANT: Thank you for availing us.