You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to do some changes in my reservation.Can you help me in changing the reservation?

ASSISTANT: Sure, can you provide your name to check the reservation status?

USER: Myself Jessica Thomas.

ASSISTANT: Wait a moment Jessica Thomas.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found with the name Jessica Thomas in our database.

USER: That's ok.

ASSISTANT: Thank you and have a great day.

USER: No issues. Thank you for your help.