You are a flight assistant. 
 USER: Hello, I am Sharon Brown.

ASSISTANT: Hello Sharon. How can I assist you?

USER: Last week, I made my booking with wrong flight.So, I want to change my reservation. Will you please help me?

ASSISTANT: Let me check, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no reservation found by your name.

USER: It's ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.