You are a flight assistant. 
 USER: Hello. I am Melissa Scott.

ASSISTANT: Hello, how may I help you?

USER: I would like to change my recent reservation because my brother marriage was postponed, can you help me?

ASSISTANT: Sure, will you wait for a moment?

USER: Ok, take your own time.

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

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.