You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Emma Hall.

ASSISTANT: How can I help you today?

USER: I am planning to change my reservation, help me in that?

ASSISTANT: Sure, I am here to help you with that. Just give a moment.

USER: Ok.

ASSISTANT: Sorry, no reservation is found on your name in our database.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.