You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you?

USER: Could you change my reservation?

ASSISTANT: Sure, I am here to help you. Can you help me with your name?

USER: Emily Clark here.

ASSISTANT: Sorry, no reservation found on your name.

USER: No problem, thank you for the information.

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