You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Christopher Adams.

ASSISTANT: How may I guide you today?

USER: I would like to change my reservation as I am leaving for delegates meet, can you please help me out?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: I am sorry to say that there is no reservation found under your name.

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you for reaching us.