You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: As my plan to visit my grand parents house got post pose so that I want to change an existing reservation. Can you please check the reservation by this name Robert Robinson ?

ASSISTANT: Sure, please wait for a while. I will check and get back to you.

USER: Sure.

ASSISTANT: Thank you for being wait. Unfortunately there is no reservation found by your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for picking us.