You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I render 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 in change an existing reservation?

ASSISTANT: Sure, let me know your good name please to further.

USER: I made a reservation by the name Shirley Adams.

ASSISTANT: Give me sometime to check and get back to you.

USER: Ok.

ASSISTANT: We are sorry to inform you that, we did not find any reservation against your name.

USER: Ok, not an issue. Thanks for your information.

ASSISTANT: Thank you for choosing us.