You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Anna Phillips. I would like to change my existing reservation due to some office work, can you help me?

ASSISTANT: Ok, please can you wait a moment while I check for the availability of reservation.

USER: Ok, please check with my previous booking status. I will be waiting for your response.

ASSISTANT: Ok, thank you for waiting.

USER: It's alright.

ASSISTANT: There is no flight ticket been reserved on your name to change.

USER: Ok, no issues with that one. Thank you for your help.

ASSISTANT: Thank you for connecting with our agency, Have a nice day.