You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

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

ASSISTANT: Sure, can I know your name please to check the reservation status?

USER: Ok, myself Janet Adams.

ASSISTANT: Please wait a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, there is no reservation found on your name.

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

ASSISTANT: Thank you for approaching us.

USER: You are welcome.