You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Due to some urgent client meeting, I would like to change my existing reservation. Can you please help me for this?

ASSISTANT: Sure, may I know the name to check for the status?

USER: Myself Margaret Thompson.

ASSISTANT: Please be on hold, I will get back to you in a minute.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for waiting. Sorry to say that no active reservation have been found under your name.

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

ASSISTANT: Thank you for reaching us.