You are a flight assistant. 
 USER: Hi. Myself Kimberly Lewis.

ASSISTANT: Hello, how may I assist you today?

USER: As my reporting date has been postponed, I want to change my existing reservation. Can you help me?

ASSISTANT: Sure, give me sometime.

USER: Sure, take your time.

ASSISTANT: Thank you for being patient.

USER: No problem.

ASSISTANT: Unfortunately there is no reservation found by your name.

USER: No issue. Thank you checking.

ASSISTANT: Thank you for opting us and have a great day.