You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

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, can I know your name please?

USER: Sure, I am Samantha Lopez here.

ASSISTANT: Ok, wait a moment please.

USER: Sure.

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

USER: Ok, not a problem.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your information.