You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, welcome to Google Agency.

USER: My name is Jennifer Mitchell.

ASSISTANT: What help can I do for you?

USER: I wanted to visit my sister for her birthday, but she decided to change the destination. Could you help me in changing the reservation?

ASSISTANT: Yes, please give me a minute. Sorry, there is no ticket booked on your name to change the reservation.

USER: That's ok. Thank you for your time.

ASSISTANT: Thank you, have a wonderful day.