You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

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

ASSISTANT: Can I know your name?

USER: Sure, my name is Larry Allen.

ASSISTANT: Sorry, no reservation found on your name.

USER: Oh! May be I have done wrong booking. thank you anyways.

ASSISTANT: Most welcome.