You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Can you help me in changing my recent reservation, as my exam is postponed?

ASSISTANT: Sure, may I know your name?

USER: I am Dorothy Smith.

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

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.