You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is James Roberts.

ASSISTANT: Ok, can you please tell me how can I assist you?

USER: Owing to an emergency, I would like to change my existing reservation. Can you help me?

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Sorry, no reservation found with your name?

USER: Its ok, no issues. Thank you for the information.

ASSISTANT: Most welcome.