You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Myself Larry Campbell. Due to some urgent meeting, I am going to change my reservation. Can you please help me for this?

ASSISTANT: Sure, please allow me a moment to check for the status.

USER: Ok, I will wait for your kind response.

ASSISTANT: Thank you for waiting.

USER: Ok,.

ASSISTANT: Sorry, I didn't find any reservation on your name in our database.

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

ASSISTANT: Thank you for reaching us.

USER: You are welcome.