You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I need to change my existing reservation am my college function got postponed, Can you please help me with that?

ASSISTANT: Let me know your name.

USER: Brenda Clark here.

ASSISTANT: Sorry, no reservation found by your name.

USER: Ok, no problem.

ASSISTANT: Thank you.

USER: Thanks for your information.