You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you today?

USER: I am Patricia Robinson. I want to change my reservation to new travel dates, can you help me?

ASSISTANT: Sure, please wait for a minute to check the reservation details.

USER: Sure, take your time.

ASSISTANT: Thanks for your patience, I could not find any reservation with your name.

USER: It's ok, thanks for checking.

ASSISTANT: Welcome.