You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, please mention your name.

USER: I am Richard Miller.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, There was no reservation found on your name.

USER: Its ok, thank you.

ASSISTANT: Thank you for choosing us.