You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Joshua Collins, want to alter my reservation dates. Can you please help me?

ASSISTANT: Sure, I can help you.

USER: Thanks.

ASSISTANT: Please wait a while.

USER: Ok.

ASSISTANT: Thanks for your time. We didn't found any reservation by this name.

USER: It's ok. Thank you for searching.

ASSISTANT: Thank you for reaching us.