You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I have planned to go for my 3rd sister-in-law birthday party in Minneapolis, but I am not feeling well to complete my journey.So can you please help me in changing my existing reservation?

ASSISTANT: Sure, please wait for a moment to check your details. Meanwhile, may I know your name?

USER: My ticket is reserved on name Melissa Martinez.

ASSISTANT: No reservation found on your name.

USER: Ok, fine not an issue.Thank you for your information.

ASSISTANT: Sorry for inconvenience. Welcome.