You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Welcome to Global agency, how can I assist you today?

USER: I am Jennifer Lee, want to do some changes in my previous reservation because I made my booking with wrong travelling dates. Will you please help me in changing my reservation?

ASSISTANT: Sure, please let me check.

USER: Sure.

ASSISTANT: Sorry Lee, no reservation has been found on your name in our database.

USER: It's ok, thank you for your help and quick response.

ASSISTANT: Thank you for contacting us, have a nice day.