You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: Steven Roberts here.

ASSISTANT: Nice to meet you Roberts.

USER: Due to sudden health issue, I am planning to change my reservation. Can you please help me out?

ASSISTANT: Sure, I am happy to help you.

USER: Thank you.

ASSISTANT: Please give me some time to check it.

USER: Sure, take your time.

ASSISTANT: Roberts, when I search in our back end there is no reservation found on your name to modify it.

USER: Oh! I think the ticket was not booked properly while I am booking. Anyway, thank you for the information.

ASSISTANT: You are welcome. Have a nice day.