You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: I made a plan to meet my client but due to some work I have to reschedule it, can you please help me to modify my travel dates?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: My name is Sarah Green.

ASSISTANT: Please wait for a minute.

USER: Sure.

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

USER: No problem, thank you for checking it.

ASSISTANT: Thank you for reaching us.