You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Emma Roberts, I want to change my reservation, can you help me to modify my travel dates?

ASSISTANT: Sure, I am here to aid you.

USER: Thank you.

ASSISTANT: Please wait for few minutes, let me check with your existing reservation status.

USER: Sure.

ASSISTANT: There is no existing reservation found on your name in our records.

USER: Ok, thanks for informing me.

ASSISTANT: Thank you for opting us.