You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Sure, can I know your name?

USER: Myself Melissa Walker.

ASSISTANT: I'm sorry Melissa, there are no reservations found with your name.

USER: Ok, no issues.

ASSISTANT: Thank you.

USER: Thank you for the information.