You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you today?

USER: I am Robert Garcia. Can you please help me in changing my existing reservation?

ASSISTANT: Sure, please wait for few minutes.

USER: Ok.

ASSISTANT: There is no existing reservation found on your name in our records.

USER: Ok, no worries at all. Thank you.

ASSISTANT: Thank you for reaching us.