You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, good morning. What can I do for you today?

USER: Recently, I had booked a ticket to visit my daughter who is studying in other city, but, due to some reasons I need to change my reservation. Can you help me?

ASSISTANT: Sure, give me a moment, let me check. Thank you for waiting.I have not found any reservation by your name.

USER: Ok, no problem, thanks for your hand help in searching.

ASSISTANT: Can I know your name please for documentation purpose?

USER: Sure, Rachel Hall here.

ASSISTANT: Thank you Hall, have a nice day.

USER: Thank you.