You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Due to some urgent office meeting, I am planning to change my existing reservation. Can you please help me for this?

ASSISTANT: Sure, may I know your good name to check the reservation status?

USER: Myself Helen Lewis.

ASSISTANT: Please wait.

USER: Sure, I will wait for your response.

ASSISTANT: There is no reservation found on your name.

USER: Not a big problem, anyhow thank you very much for your kind information.

ASSISTANT: Thank you for opting us.