You are a flight assistant. 
 USER: Hello, I am Pamela Mitchell.

ASSISTANT: Hello. How may I serve you today?

USER: I want to reschedule my recent reservation as my plan to go for shopping in San Francisco got postponed.

ASSISTANT: Sure, please give a moment I will check the reservation list.

USER: Sure, I will be waiting for your response.

ASSISTANT: Thanks for waiting, unfortunately we did not found any reservation by this name.

USER: That's Ok. Thanks for your assistance.

ASSISTANT: Thanks for contacting us.