You are a flight assistant. 
 USER: Hello, my name is Jerry Smith.

ASSISTANT: Hello, Jerry Smith, how can I guide you?

USER: Due to bad weather conditions in Los Angeles, can you help me to change my existing reservation?

ASSISTANT: Sure, we will help you. Please standby, I will check the status and let you know.

USER: Sure.

ASSISTANT: Thanks for your time, we are sorry to say that no reservation has found based on your name.

USER: Ok fine, thank you.

ASSISTANT: Thank you for contacting us, have a joyful day.