You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you at this moment?

USER: Patricia Anderson here. Can you help me to change my recent reservation because my health condition was not good, can you help me?

ASSISTANT: Sure, I can help you and can you with that one.

USER: Thank you.

ASSISTANT: Please give me a moment to check it.

USER: Sure, take your own time.

ASSISTANT: Thank you for waiting, there is no reservation found for the user name in our back end to help you in changing.

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

ASSISTANT: You are most welcome and have a nice day.