You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. May I know your name?

USER: Owing to an emergency, my business conference got postponed. So I had a request to you to change my existing reservation? Sure, I had a reservation with name Mary Adams.

ASSISTANT: Sure, I can help you. Please wait a while.

USER: Sure.

ASSISTANT: Thanks for being waiting. We didn't found any reservation by this name.

USER: Ok, no worries at all. Thanks for your kind service.

ASSISTANT: Thank you for consulting us.