You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I provide assistance to you?

USER:  I am Christopher Green want to travel to MA-BOS to meet my sister from TX-DFW. Can you book a connecting flight?

ASSISTANT: Sure, we are rapturous to help you. May I know on which dates you are willing to travel?

USER:  My travel dates are 05/09 and 05/11.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Thank you for waiting, we are sorry to inform you that, there is no flights with your respective dates of travel.

USER: Ok, thank you for your help.

ASSISTANT: Thank you for opting us.