You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you?

USER: Can you please help me to change my reservation?

ASSISTANT: Sure, I will help you. On which name you have reserved your previous reservation?

USER: My name is Ashley Lewis.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Sorry to inform you that, there is no ticket booking under your name to change the details.

USER: Ok, not a problem. Thank you.

ASSISTANT: You are welcome. Thank you for choosing us.