You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER:  I need to cancel my reservation due to some personal issues.So can you help me with cancellation of my reservation?

ASSISTANT: Sure, I am here to help you. May I know your name?

USER: I am Melissa Garcia.

ASSISTANT: There is no reservation found under your name.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for choosing us.