You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to change my trip because of some issues.can you help me in this?

ASSISTANT: Ok, tell me your name for changing.

USER: Check my details on Karen Martinez.

ASSISTANT: Sorry, I didn't find any reservations by your name.

USER: That's ok.

ASSISTANT: Thanks for reaching us. Have a great day.

USER: Thank you for your help.