You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How can I render you today?

USER: My name is Emma Green, I want to change my reservation as my plan to meet my friend at Washington is postponed. Can you help me to change my reservation?

ASSISTANT: Sure, we are here to aid you. Please, wait for a while.

USER: Sure.

ASSISTANT: Thanks for your valuable time. We regret to say that, there is no active reservation found on your name.

USER: Thank you for the information.

ASSISTANT: Thank you for availing us. Hope to serve you again.