You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you?

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

ASSISTANT: Sure, may I know your name?

USER: I am Margaret Walker.

ASSISTANT: Please wait a second.

USER: Sure, take your time.

ASSISTANT: Sorry, no reservation found on your name.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for opting us.