You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Thomas Nelson. I am planning to go for science exhibition at New York, LGA. Can you please book a ticket on 02/21?

ASSISTANT: Sure, we will help you in booking.

USER: Thank you.

ASSISTANT: Please share you return date?

USER: I will return on 02/23.

ASSISTANT: Ok, let me know your boarding point?

USER: Source code is Boston, BOS.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, no flights found with your requested details.

USER: No problem. Thank you.

ASSISTANT: Thank you for opting us.