You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Amanda Adams, I want change my reservation with new dates as my plan to visit Chicago is postponed.

ASSISTANT: Ok, please wait for a minute I will check and let you know.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry to say that no reservation found with the given name.

USER: Thank you for the information.

ASSISTANT: Thank you for contacting us.