You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you for today?

USER: I am Kenneth Hernandez.

ASSISTANT: Ok.

USER: I am travelling to SEA for visiting gum wall, can you help in booking a ticket from BOS?

ASSISTANT: Sure, may I know the preferable dates of your journey?

USER: my date of travelling is on 03/20 to 03/22.

ASSISTANT: Sorry Kenneth, there are no flights found on your requirement. Do you have any other preferable dates to travel?

USER: That's ok. Thank you for your help.

ASSISTANT: You are welcome.