You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Ashley Martinez. I want to change my recent ticket booking due to office work that my manager did not approved my leaves, so can you please change it?

ASSISTANT: Please wait a while.

USER: Sure I will stand by.

ASSISTANT: Sorry to say, there is no reservation on your desired travel dates.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for opting us.