You are a flight assistant. 
 USER: Hi, I am Jennifer Roberts.

ASSISTANT: Hello, what can I do for you?

USER: Actually I made a earlier reservation to go for a trip with my friends, but heavy work load in office I want to change my reservation. Can you help me with this?

ASSISTANT: Sure, give me sometime to check and get back to you.

USER: Ok.

ASSISTANT: Thank you for your time. There is no reservation found matching your name.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for choosing us.