You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Can you please tell me how may I help you?

USER: Owing to an emergency I had to request for this change reservation, Can you please help me in that?

ASSISTANT: Sure, I am here to help you in changing the ticket details. May I know your name please?

USER: My name is James Clark.

ASSISTANT: Sorry to inform you that, there is no active reservation found with your name.

USER: Ok, that's not a problem. Thanks for your information.

ASSISTANT: You are welcome. Thank you for opting us.