You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know how best I can help you today?

USER: I planned to give a presentation at New York, but due to sudden change in my trip to another location, I would like to change my reservation. Can you please help me out?

ASSISTANT: We are euphoric to help you. Can I have your good name to check your reservation?

USER: Reservation was made on the name of Sandra Gonzalez.

ASSISTANT: Can you please wait for a moment, I will check with your reservation.

USER: Sure.

ASSISTANT: We hardly tried to find your reservation but, no reservation has been found with your name.

USER: That's fine, thanks for the response.

ASSISTANT: Thank you for choosing us.