You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you?

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

ASSISTANT: Sure, may I know your name?

USER: My name is Gregory Wright.

ASSISTANT: Please wait for a minute.

USER: Sure.

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

USER: Ok, not a problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you.