You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Can you please change my reservation as my sister got the journey dates wrong?

ASSISTANT: Sure, I can help you to change the ticket details. Can you please tell me your name?

USER: I am Steven Johnson.

ASSISTANT: Ok, please give me a minute.

USER: Sure, I will wait for your reply.

ASSISTANT: Sorry to inform you, there is no reservation on your name to change the details.

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

ASSISTANT: Most welcome. Thank you for approaching us.