You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Ashley Rodriguez.

ASSISTANT: How may I assist you today?

USER: I have a meeting to attend at Boston. Can you help me in booking a ticket from ORD to BOS?

ASSISTANT: Sure, I am happy to help you in booking flight ticket. Could you please let me know your travel dates for booking flight ticket?

USER: My preferred journey dates are 05/15 and 05/17.

ASSISTANT: Rodriguez, there are no flights that are moving on the dates that you have provided due to sold out of tickets.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: My pleasure.