You are a flight assistant. 
 USER: Hello.

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

USER: Can you help me to change my recent reservation?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please mention your name to check further in our database.

USER: Jennifer Smith here.

ASSISTANT: Please stand by.

USER: Sure.

ASSISTANT: Sorry, no reservation found with your given name in our database to change it.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for contacting us and have a nice day.