You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I want to change my reservation because of my health issues.Can you please help me out?

ASSISTANT: Sure, I can help you with it.

USER: Thank you.

ASSISTANT: May I know your name to go back and find our your previous reservation?

USER: Sure, my name is Betty Perez.

ASSISTANT: Betty Perez, sorry to inform you that no reservation found under your name.

USER: No problem, I will search with another flight to complete my trip.

ASSISTANT: Thank you for choosing our agency, please contact us for your further bookings also.

USER: Thank you for your information.

ASSISTANT: Have a nice day.