You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I serve you today?

USER: I am Amanda Taylor. I made a reservation earlier this week to give a seminar but due to weather conditions I need to change the reservation dates. Can you help me in changing my reservation?

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting.

USER: Ok.

ASSISTANT: Sorry we couldn't find any reservation with your  name.

USER: Ok, thank you.

ASSISTANT: Thank you for choosing us.