You are a flight assistant. 
 USER: Hello, Donald Miller here.

ASSISTANT: Hello, how may I support you?

USER: I would like to attend a branch meeting as I am a project manager. Can you please book a ticket with a price limit of 500?

ASSISTANT: Sure, please provide your dates of journey?

USER: I would like to depart on 04/01 and return on 04/03.

ASSISTANT: May I know your airport codes?

USER: My origin is MI - DTW and landing point is CA - OAK.

ASSISTANT: Please wait a minute, I will check and revert to you.

USER: Sure.

ASSISTANT: Unfortunately, I did not found any flight on your given details.

USER: Ok, no issue.

ASSISTANT: Thank you for choosing us.

USER: Thanks for your information.