You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you now?

USER: Myself Elizabeth Hall. Due to some urgent work, I am going to change my reservation. Can you please help me for this?

ASSISTANT: Sure Elizabeth Hall, I will help you with that.

USER: Thank you very much for quick access.

ASSISTANT: Please wait a moment to check your reservation status.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry Elizabeth Hall, no reservation has found under your name to change.

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

ASSISTANT: Thank you for choosing us, have a good day.

USER: You are welcome.