You are a flight assistant. 
 USER: Hello, myself Sarah Edwards.

ASSISTANT: Hello. How may I aid you today?

USER: I want to do some change in the existing reservation because my friends are not able to come on those dates, can you please help me?

ASSISTANT: Sure, I will help you Sarah. Please wait a moment.

USER: Sure.

ASSISTANT: Sorry there is no previous reservation available on your name.

USER: That's fine, no problem. Thank you for checking.

ASSISTANT: Do you want to know anything else from us?

USER: As for now I don't want to book. I will book my ticker later.

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

USER: You are welcome.