You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I have planned to go for ORD to meet my best friend unfortunately the meeting was postponed, can you please help me to change my existing reservation?

ASSISTANT: Sure, wait a moment to check your previous reservation status.

USER: I'm Rachel carter.

ASSISTANT: Sorry Rachel, we don't found any reservation in our database.

USER: Ok, fine.

ASSISTANT: Do you want to ask us anything else?

USER: No. Thank you for your help.

ASSISTANT: Thank you for consulting us, have a nice day.