You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I just want to change an existing reservation due to heavy rains in my town. Can you please check the reservation by this name Margaret Lopez?

ASSISTANT: Ok, please wait a while.

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 reaching us.