You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Joseph Thomas here.

ASSISTANT: Ok.

USER: Can you please help me in changing my recent reservation? As my planned trip has been postponed some other dates.

ASSISTANT: Sure, will you please give me a moment?

USER: Sure, take your own time.

ASSISTANT: Thanks for waiting, there is no reservation found under your name.

USER: That's ok, thank you for giving the information.

ASSISTANT: Welcome, have a great day.