You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: I am planning to change my arrival day in my existing reservation, can you please help me out?

ASSISTANT: Sure, I will help you with that. May I know your name please?

USER: Sure, my name is Gregory Garcia.

ASSISTANT: Please wait for a minute.

USER: Ok, take your time.

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

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for reaching us.