You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you now?

USER: My name is Emma Allen, can you please help me to change my reservation?

ASSISTANT: Sure, I will help you with that. Sorry, there is no reservation found on your name.

USER: Ok, no problem.

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

USER: Thank you for reaching us.

ASSISTANT: You are welcome.