You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Rachel Smith.

ASSISTANT: Rachel, how may I assist you?

USER: I would like to meet  my Grandfather, can you please help me in booking my ticket? I would like to travel from LAX to IAD.

ASSISTANT: Sure, can I know the details of travel?

USER: My travel dates are 02/27 and 02/29.

ASSISTANT: Hold on for a moment. I'm sorry Rachel, there are no flights matching your dates.

USER: Sure, I will go with my parents next time. Thank you for checking.

ASSISTANT: Thank you, have a good day.