You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: There is an emergency case which came to hearing on the dates which I have planned to enjoy in my holidays, so I am unable to travel the trip due to this one. Can you please help me in changing my flight ticket?

ASSISTANT: Sure, I am here to help you with this.

USER: Thank you.

ASSISTANT: May I know your name please for further processing?

USER: Sure, I am Anna Robinson.

ASSISTANT: Sorry Anna, there is no reservation found under your name to change it.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: You are welcome.