You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself Joshua Clark.

ASSISTANT: How can I aid you?

USER: I want to change my reservation as my mother is unwell, can you please help me to change my reservation?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Joshua Clark, we couldn't find any reservation under your name in our database.

USER: Not an issue, anyway thank you for checking.

ASSISTANT: Thank you for reaching us.