You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Paul Mitchell from Oakland.

ASSISTANT: Mitchell, how may I help you?

USER: I want to change my reservation due to not feeling well, can you help me?

ASSISTANT: Sure, please give me a moment to check your ticket status.

USER: Ok, take your time.

ASSISTANT: Sorry, no reservation is found by your name.

USER: No problem. Thank you for checking.

ASSISTANT: Thank you for contacting us.