You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know your name please?

USER: My name is Anna Walker.

ASSISTANT: Anna Walker, how can I assist you?

USER: My convocation is going to held in MSP, can you book a ticket from BOS?

ASSISTANT: Sure, may I know the travelling dates?

USER: My travel dates are 04/29 and 05/01.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry Anna, there are no flights found on your requirements.

USER: No problem. Thank you for checking.

ASSISTANT: Thank you for contacting us, have a great day.