You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Richard Evans.

ASSISTANT: How may I aid you today?

USER: I need to change my existing reservation, Can you please help me with that?

ASSISTANT: Sure, please wait a moment I will check the reservation status.

USER: Sure.

ASSISTANT: Thank you for waiting, unfortunately there is no reservation found by your name.

USER: Ok, no problem.

ASSISTANT: Thank you for picking us.

USER: Thanks for your information.