You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, may I know your name?

USER: I am Benjamin Davis.

ASSISTANT: How may I help you Benjamin?

USER: I would like to change an existing reservation due to sudden change in a trip.

ASSISTANT: Sure, let me check the status and revert you.

USER: Ok.

ASSISTANT: Thanks for your time. We found your reservation. May I know your updated journey details to proceed?

USER:  Sure,I would like to travel from CA-LAX to MA-BOS.

ASSISTANT: Can you provide your travel dates aswell?

USER: My travelling dates are 09/13 and 09/15. I need a direct flight.

ASSISTANT: Ok. There are no flights available at this moment.

USER: NO issue.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your response.