You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself James Hall.

ASSISTANT: James, how can I assist you?

USER: I am having sudden meeting in my office, can you please help me changing my reservation?

ASSISTANT: Sure, I will help you. Please wait, I will check your reservation status and get back to you.

USER: Ok, I will wait for your reply.

ASSISTANT: Sorry, no reservation found under your name in our database.

USER: That's fine, not an issue. Thank you for your information.

ASSISTANT: You are most welcome.