You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I aid you today?

USER: Can you please help me in changing my existing reservation, as my exam got postponed.

ASSISTANT: Sure, I will help you with that. May I know your name please?

USER: Myself, Elizabeth Thomas.

ASSISTANT: Please wait for a minute.

USER: Ok.

ASSISTANT: I am sorry to say that there is no flight found under your name.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thank you for reaching us.