You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I am Jack Williams. Owing to emergency, I need to change my recent reservation. Please help me with that.

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no active reservation found on your name to change.

USER: Thank you for your help.

ASSISTANT: Thanks for availing us, have a nice day.

USER: Most Welcome.