You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you today?

USER:     Can you please help me in changing my reservation?

ASSISTANT: Sure, let me know your name to check further in our portal?

USER: My name is Betty Turner.

ASSISTANT: Sorry, no reservation found on your name in our portal to change it.

USER: Ok, no problem. Thank you for the response.

ASSISTANT: Thank you for contacting us.