You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Carol Adams.

ASSISTANT: Carol, how can I assist you?

USER: Due to some changes in my trip, I want to change my existing reservation. Can you help me?

ASSISTANT: Sure. Please wait for a while.

USER: Ok.

ASSISTANT: Sorry, no reservation found by your name.

USER: No issues. Thank you for your time.

ASSISTANT: Thank you for reaching us.