You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Can you share your name?

USER: Elizabeth Allen here.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.